1.Status and implications of pharmacist competency assessment tools
Yu TIAN ; Bei DING ; Chenyang ZHANG ; Yi ZHAO ; Jiaying WANG
China Pharmacy 2026;37(5):553-558
OBJECTIVE To systematically review the status on pharmacist competency assessment tools both domestically and internationally, providing a theoretical basis for constructing scientific and applicable pharmacist competency assessment tools in China. METHODS Through literature review and comparative analysis, 15 representative domestic and international pharmacist competency assessment tools were systematically summarized, and their theoretical foundations, core dimensions, methodological characteristics and practical applications were compared and implications were given. RESULTS &CONCLUSIONS International research has established relatively mature evaluation systems. Represented by those developed from the United Kingdom, the United States, and the International Pharmaceutical Federation, these assessment tools demonstrate scientific structure, wide application, and dynamic and international applicability. While domestic research has progressed in sub-specialties such as clinical pharmacists, licensed pharmacists and pediatric pharmacists, it still faces challenges including insufficient standardization, inadequate validation, delayed updates, and limitations in practical application. The reasons for the disparities in assessment tools between China and other countries include differences in pharmaceutical care models, varying pharmacist training systems, cultural and social background factors, as well as differences in industry management and international influence. Based on this, the author suggests promoting the development and research of assessment tools for pharmacist job competency in China from four aspects: mechanism construction, system refinement, standardization development, and practical implementation.
2.Integrated traditional Chinese and Western medicine therapy for Wilson disease
Yumei GU ; Yeqing HUANG ; Bei ZHANG ; Aiqun LIU ; Zhongxing PENG ; Mingfan HONG ; Zhihua ZHOU
Journal of Clinical Hepatology 2026;42(3):529-534
Wilson disease (WD) is one of the few treatable neurogenetic disorders. Currently, Western medicine remains the main treatment method for WD, while since the 1990s, multiple studies conducted by Professor Yang Renmin and his team have shown that traditional Chinese medicine (TCM) also has a favorable therapeutic effect. Based on the principle of low-copper diet for WD, this article systematically elaborates on the advantages, limitations, and key considerations of current Western medicine therapies (pharmacotherapy, liver transplantation, and splenectomy) and reviews the research findings of TCM in China, especially the wide application of Gandou Decoction in clinical practice. Studies have shown that Gandou Decoction can effectively improve neurological symptoms, protect hepatic and renal function, and avoid the adverse drug reactions associated with metal chelating agents, and therefore, it can be used an effective long-term adjuvant therapy for WD. It should be noted that symptoms and signs should be considered in integrated traditional Chinese and Western medicine therapy for WD, and high-copper TCM drugs should be avoided to prevent deterioration.
3.Effect of Xiaoqinglong Decoction (小青龙汤) on Th2 Immune Responses and Nasal Mucosal TSLP/OX40L Pathway in Allergic Rhinitis Model Rats
Yimeng CHEN ; Yuye CHEN ; Guangchun YU ; Bei CHEN ; Jianwei ZHANG ; Shanshan DING ; Xiaoting YANG ; Baifan YU ; Yating CAI ; Xuejuan LIN ; Mengting ZHANG
Journal of Traditional Chinese Medicine 2026;67(9):994-1002
ObjectiveTo explore the potential mechanism of Xiaoqinglong Decoction (小青龙汤, XD) in the treatment of allergic rhinitis. MethodsForty-five rats were randomly assigned to a control group, a model group, a loratadine group, low-, medium- and high-dose XD groups, and low-, medium- and high-dose Mahuang Decoction and Cang'erzi Powder (麻黄汤合苍耳子散, MDCP) groups. Except for the control group, rats were administered with ovalbumin (OVA) and aluminum hydroxide via intraperitoneal injection for 14 days to establish an allergic rhinitis model. After the 14th-day injection, nasal stimulation was continued with 20 μl of 10% OVA solution to maintain the model. Rats in the control group and the model group received 10 ml/(kg·d) of saline, whereas those in the loratadine group were administered with 0.9 mg/(kg·d) of loratadine. The low-, medium- and high-dose XD groups were administered XD at the dose of 2.7, 5.4, and 10.8 g/(kg·d), respectively. The low-, medium- and high-dose MDCP groups were administered MDCP at the dose of 2.43, 4.86, and 9.72 g/(kg·d), respectively. All treatments were administered by gavage once daily for 7 consecutive days. One hour after the final gavage, nasal symptom scores were recorded for all group of rats. The next day, serum levels of immunoglobulin E (IgE), interleukin-4 (IL-4), and interleukin-13 (IL-13) were measured. HE staining was used to observe the pathological morphology of the nasal mucosal tissue. Quantitative reverse transcription PCR (RT-qPCR) and Western Blot were performed to assess mRNA and protein expression of thymic stromal lymphopoietin (TSLP) and OX40 ligand (OX40L) in the nasal mucosa. ResultsCompared to the control group, total nasal symptom score in the model group significantly increased (P<0.01). HE staining revealed disrupted and adhered cilia, thickened basement membranes, and extensive inflammatory cell infiltration in the nasal mucosa. Serum levels of total IgE, IL-4, and IL-13, as well as TSLP and OX40L mRNA and protein expression in the nasal mucosa, were significantly elevated in the model group (P<0.05 or P<0.01). Compared to the model group, the total nasal symptom scores in all drug intervention groups were significantly reduced; the serum total IgE levels in the loratadine group, the low- and medium-dose XD groups, and the low- and high-dose MDCP groups were significantly reduced; and the serum levels of IL-4 and IL-13 in the high-dose XD group and the high-dose MDCP group decreased (P<0.05 or P<0.01). Nasal mucosal structure was improved. Except for the low-dose MDCP group, all other intervention groups showed a significant reduction in TSLP and OX40L mRNA expression in the nasal mucosa (P<0.01). All doses of XD and the medium- and high-dose MDCP groups significantly decreased the protein levels of TSLP and OX40L (P<0.05). The medium-dose XD group exhibited more improvement of nasal symptom scores and greater suppression of expression of TSLP and OX40L mRNA, and TSLP protein levels compared to the loratadine group (P<0.05). ConclusionXD may protect nasal mucosa of rats and alleviate allergic rhinitis by suppressing the TSLP/OX40L pathway, thereby attenuating Th2-mediated immune responses.
4.Effect of Xiaoqinglong Decoction (小青龙汤) on Th2 Immune Responses and Nasal Mucosal TSLP/OX40L Pathway in Allergic Rhinitis Model Rats
Yimeng CHEN ; Yuye CHEN ; Guangchun YU ; Bei CHEN ; Jianwei ZHANG ; Shanshan DING ; Xiaoting YANG ; Baifan YU ; Yating CAI ; Xuejuan LIN ; Mengting ZHANG
Journal of Traditional Chinese Medicine 2026;67(9):994-1002
ObjectiveTo explore the potential mechanism of Xiaoqinglong Decoction (小青龙汤, XD) in the treatment of allergic rhinitis. MethodsForty-five rats were randomly assigned to a control group, a model group, a loratadine group, low-, medium- and high-dose XD groups, and low-, medium- and high-dose Mahuang Decoction and Cang'erzi Powder (麻黄汤合苍耳子散, MDCP) groups. Except for the control group, rats were administered with ovalbumin (OVA) and aluminum hydroxide via intraperitoneal injection for 14 days to establish an allergic rhinitis model. After the 14th-day injection, nasal stimulation was continued with 20 μl of 10% OVA solution to maintain the model. Rats in the control group and the model group received 10 ml/(kg·d) of saline, whereas those in the loratadine group were administered with 0.9 mg/(kg·d) of loratadine. The low-, medium- and high-dose XD groups were administered XD at the dose of 2.7, 5.4, and 10.8 g/(kg·d), respectively. The low-, medium- and high-dose MDCP groups were administered MDCP at the dose of 2.43, 4.86, and 9.72 g/(kg·d), respectively. All treatments were administered by gavage once daily for 7 consecutive days. One hour after the final gavage, nasal symptom scores were recorded for all group of rats. The next day, serum levels of immunoglobulin E (IgE), interleukin-4 (IL-4), and interleukin-13 (IL-13) were measured. HE staining was used to observe the pathological morphology of the nasal mucosal tissue. Quantitative reverse transcription PCR (RT-qPCR) and Western Blot were performed to assess mRNA and protein expression of thymic stromal lymphopoietin (TSLP) and OX40 ligand (OX40L) in the nasal mucosa. ResultsCompared to the control group, total nasal symptom score in the model group significantly increased (P<0.01). HE staining revealed disrupted and adhered cilia, thickened basement membranes, and extensive inflammatory cell infiltration in the nasal mucosa. Serum levels of total IgE, IL-4, and IL-13, as well as TSLP and OX40L mRNA and protein expression in the nasal mucosa, were significantly elevated in the model group (P<0.05 or P<0.01). Compared to the model group, the total nasal symptom scores in all drug intervention groups were significantly reduced; the serum total IgE levels in the loratadine group, the low- and medium-dose XD groups, and the low- and high-dose MDCP groups were significantly reduced; and the serum levels of IL-4 and IL-13 in the high-dose XD group and the high-dose MDCP group decreased (P<0.05 or P<0.01). Nasal mucosal structure was improved. Except for the low-dose MDCP group, all other intervention groups showed a significant reduction in TSLP and OX40L mRNA expression in the nasal mucosa (P<0.01). All doses of XD and the medium- and high-dose MDCP groups significantly decreased the protein levels of TSLP and OX40L (P<0.05). The medium-dose XD group exhibited more improvement of nasal symptom scores and greater suppression of expression of TSLP and OX40L mRNA, and TSLP protein levels compared to the loratadine group (P<0.05). ConclusionXD may protect nasal mucosa of rats and alleviate allergic rhinitis by suppressing the TSLP/OX40L pathway, thereby attenuating Th2-mediated immune responses.
5.A Personalized Brain-computer Interface Paradigm and Decoding Method for The Objective Evaluation of Auditory Frequency Difference Limen
Sheng-Ye LI ; Xiao-Lin XIAO ; Shi-Hang YU ; Bei-Bei ZHANG ; Xing-Wei AN ; Min-Peng XU ; Dong MING
Progress in Biochemistry and Biophysics 2026;53(7):1927-1941
ObjectiveThe frequency difference limen (FDL) serves as a fundamental metric utilized for effectively quantifying the precise perceptual capabilities of the central auditory system. However, traditional measurement methods rely heavily on the active behavioral responses of subjects and are consequently highly susceptible to the negative influence of confounding subjective factors. Furthermore, existing research paradigms frequently employ uniform stimulus configurations that overlook critical individual perceptual differences. Based on brain-computer interface (BCI) technology, this comprehensive study aims to establish an objective and quantitative evaluation method for auditory frequency discrimination by systematically analyzing and decoding the specific neural responses elicited at the exact threshold state. MethodsWe designed a personalized rapid serial auditory presentation (RSAP) paradigm customized based on each individual’s precise FDL. A cohort of eleven healthy participants was recruited to evaluate the paradigm using pure-tone sequences at a baseline frequency of 4 000 Hz. This experimental paradigm simulates a realistic auditory perception environment through the continuous presentation of acoustic stimuli, thereby allowing for an in-depth investigation into the specific neural representations evoked by weak frequency deviations at the threshold state. Given that auditory stimulus-evoked response features exhibit complex and differentiated spatiotemporal distribution patterns across multiple frequency domains, this study further deeply integrates the cross-scale feature interaction module with the dynamic spatiotemporal attention allocation strategy, innovatively proposing the Multi-Scale Spatial-Temporal Dual Attention Network (MS-STAMNet). Specifically, the network constructs parallel processing branches with multiple receptive fields and introduces a dynamic adaptive weighting strategy to precisely localize core neural activity signals, further deeply integrating multi-scale information through cross-branch feature information interaction to achieve robust single-trial decoding of weak auditory evoked responses. ResultsThe comprehensive electrophysiological data analysis demonstrated that subtle auditory frequency deviation stimuli presented at the threshold level successfully elicited pronounced N2 and P3 event-related potential features, reflecting pre-attentive mismatch detection and subsequent cognitive evaluation, which were prominently distributed over the frontal, central, and temporal regions of the scalp. In the complex time-frequency domain, the extracted neural response characteristics exhibited distinct, statistically significant event-related synchronization within both the low-frequency δ and θ frequency bands, which was simultaneously accompanied by a widespread, prominent event-related desynchronization within the higher α band. A comparative analysis of model performance demonstrated that MS-STAMNet achieved an average unweighted average recall (UAR) of (69.67±6.12)% and area under the curve (AUC) of 0.761 8±0.07, significantly outperforming the established baseline models such as EEGNet and PLNet. Furthermore, a distinct dissociation phenomenon was verified between neural decoding and behavioral performance through regression analysis (R2=0.016, P=0.709), indicating that this model can effectively capture the implicit features of subtle frequency deviations, even when they fail to trigger explicit conscious responses. Additionally, attention weight visualization analysis further reveals the highly accurate focus of the network on key features concentrated over the bilateral temporal and fronto-parietal regions. ConclusionThis study systematically and comprehensively uncovers the multi-dimensional spatiotemporal evolutionary patterns of complex neural responses processing subtle acoustic variations under long-sequence threshold auditory stimulation. Concurrently, it verifies the efficacy and robustness of the proposed MS-STAMNet architecture in accurately deciphering weak, single-trial electroencephalogram signals amidst complex background noise. Ultimately, these neurophysiological and algorithmic findings lay a solid theoretical and methodological foundation for the objective and quantitative evaluation of individual auditory cognitive capabilities in clinical applications, transcending the fundamental limitations of traditional behavioral paradigms and providing robust technical support for future auditory research and related clinical assessments.
6.Value of different noninvasive diagnostic models in the diagnosis of esophageal and gastric varices with significant portal hypertension in compensated hepatitis B cirrhosis
Cheng LIU ; Jiayi ZENG ; Mengbing FANG ; Zhiheng CHEN ; Bei GUI ; Fengming ZHAO ; Jingkai YUAN ; Chaozhen ZHANG ; Meijie SHI ; Yubao XIE ; Xiaoling CHI ; Huanming XIAO
Journal of Clinical Hepatology 2025;41(2):263-268
ObjectiveTo investigate the value of different noninvasive diagnostic models in the diagnosis of esophageal and gastric varices since there is a high risk of esophageal and gastric varices in patients with compensated hepatitis B cirrhosis and significant portal hypertension, and to provide a basis for the early diagnosis of esophageal and gastric varices. MethodsA total of 108 patients with significant portal hypertension due to compensated hepatitis B cirrhosis who attended Guangdong Provincial Hospital of Traditional Chinese Medicine from November 2017 to November 2023 were enrolled, and according to the presence or absence of esophageal and gastric varices under gastroscopy, they were divided into esophageal and gastric varices group (GOV group) and non-esophageal and gastric varices group (NGOV group). Related data were collected, including age, sex, imaging findings, and laboratory markers. The chi-square test was used for comparison of categorical data between groups; the least significant difference t-test was used for comparison of normally distributed continuous data between groups, and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between groups. The receiver operating characteristic (ROC) curve was plotted to evaluate the diagnostic value of five scoring models, i.e., fibrosis-4 (FIB-4), LOK index, LPRI, aspartate aminotransferase-to-platelet ratio index (APRI), and aspartate aminotransferase/alanine aminotransferase ratio (AAR). The binary logistic regression method was used to establish a combined model, and the area under the ROC curve (AUC) was compared between the combined model and each scoring model used alone. The Delong test was used to compare the AUC value between any two noninvasive diagnostic models. ResultsThere were 55 patients in the GOV group and 53 patients in the NGOV group. Compared with the NGOV group, the GOV group had a significantly higher age (52.64±1.44 years vs 47.96±1.68 years, t=0.453, P<0.05) and significantly lower levels of alanine aminotransferase [42.00 (24.00 — 17.00) U/L vs 82.00 (46.00 — 271.00) U/L, Z=-3.065, P<0.05], aspartate aminotransferase [44.00 (32.00 — 96.00) U/L vs 62.00 (42.50 — 154.50) U/L,Z=-2.351, P<0.05], and platelet count [100.00 (69.00 — 120.00)×109/L vs 119.00 (108.50 — 140.50)×109/L, Z=-3.667, P<0.05]. The ROC curve analysis showed that FIB-4, LOK index, LPRI, and AAR used alone had an accuracy of 0.667, 0.681, 0.730, and 0.639, respectively, in the diagnosis of esophageal and gastric varices (all P<0.05), and the positive diagnostic rates of GOV were 69.97%, 65.28%, 67.33%, and 58.86%, respectively, with no significant differences in AUC values (all P>0.05), while APRI used alone had no diagnostic value (P>0.05). A combined model (LAF) was established based on the binary logistic regression analysis and had an AUC of 0.805 and a positive diagnostic rate of GOV of 75.80%, with a significantly higher AUC than FIB-4, LOK index, LPRI, and AAR used alone (Z=-2.773,-2.479,-2.206, and-2.672, all P<0.05). ConclusionFIB-4, LOK index, LPRI, and AAR have a similar diagnostic value for esophageal and gastric varices in patients with compensated hepatitis B cirrhosis and significant portal hypertension, and APRI alone has no diagnostic value. The combined model LAF had the best diagnostic efficacy, which provides a certain reference for clinical promotion and application.
7.Value of internal stratification analysis of abdominal wall muscles in predicting complications after orthotopic liver transplantation
Xin SHI ; Chongxiao LIANG ; Bei ZHANG ; Jiping WANG
Journal of Clinical Hepatology 2025;41(2):314-321
ObjectiveTo divide the muscle into different subzones according to different density ranges using the stratified analysis on the basis of myosteatosis, and to investigate the effect of muscle density changes on complications (Clavien-Dindo grade ≥Ⅲ) after orthotopic liver transplantation (OLT). MethodsA retrospective analysis was performed for the medical records of 145 patients who underwent OLT in The First Hospital of Jilin University from May 2013 to September 2020, and with the plain CT scan images of the largest level of lumbar 3 vertebrae of each patient as the original data, Neusoft Fatanalysis software was used to measure related muscle parameters. The independent-samples t test was used for comparison of normally distributed continuous data between two groups, and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups. The chi-square test or Fisher test was for comparison of categorical data between two groups. RIAS software was used to extract clinical features and perform analysis and modeling, and three machine learning models of logistic regression (LR), support vector machine (SVM), and random forest (RFC) were constructed. The receiver operating characteristic (ROC) curve, the calibration curve, and the decision curve were plotted for each model to calculate the area under the ROC curve (AUC), sensitivity, specificity, precision, F1 score, and accuracy. ResultsThe three machine learning models of LR-C, SVM-C, and RFC-C were established based on the 7 clinical features before muscle stratification analysis, among which the RFC-C model had an AUC of 0.803, a sensitivity of 0.588, and a specificity of 0.778 in the test set. Among the models of LR-CS, SVM-CS, and RFC-CS established based on the 16 clinical features after muscle stratification analysis, the LR-CS and SVM-CS models had an AUC of 0.852 in the test set, with a sensitivity of 0.765 and 0.706, respectively, and a specificity of 0.889 and 0.926, respectively. Comparison of the AUC, sensitivity, specificity, precision, F1 score, and accuracy of each model in the test set before and after muscle stratification analysis showed that there were improvements in the parameters of the predictive model after muscle stratification analysis. Comparison of the decision curves and calibration curves of each predictive model showed that the LR-CS and SVM-CS models had good efficacy in predicting postoperative complications (Clavien-Dindo grade≥Ⅲ) in OLT patients. ConclusionOn the basis of myosteatosis, the division of the muscle into different subzones according to different densities using the stratified analysis has a certain value in predicting postoperative complications in patients with OLT.
8.Prospective Study on Tooth Loss and Risk of Esophageal Cancer Among Residents of A Natural Village in Wenfeng District, Anyang City, Henan Province
Jingjing WANG ; Ruihua XU ; Yanfang ZHANG ; Xueke ZHAO ; Qiang ZHANG ; Xin SONG ; Mengxia WEI ; Junfang GUO ; Xuena HAN ; Yaru FU ; Bei LI ; Junqing LIU ; Lingling LEI ; Min LIU ; Qide BAO ; Lidong WANG
Cancer Research on Prevention and Treatment 2025;52(7):548-553
Objective To investigate the relationship between tooth loss and the occurrence of esophageal cancer in a natural village in Wenfeng District, Anyang City, Henan Province. Methods A prospective cohort study was conducted to observe the occurrence of tooth loss and esophageal cancer among the asymptomatic residents of the natural village for 16 years from January 2008 to July 2024. Data were analyzed by chi-square test, binary logistic regression, and restricted cubic spline. Results Among the total population of 711 cases, 136 cases were lost to follow-up and 575 cases were included in the final statistics, including 45 cases with esophageal cancer. Significant statistical difference was found between esophageal cancer patients with and without tooth loss (P<0.05). Logistic regression analysis showed that tooth loss was associated with the occurrence of esophageal cancer (OR=3.977, 95%CI: 1.543-10.255). After the adjustment for confounders, tooth loss
9.Analysis of pollution of PM 2.5 in children s bedrooms caused by using solid fuels and the influencing factors
ZHENG Ping, SHI Chunli, XIN Shuzhi, CHEN Shunqiang, SHEN Yue, ZHANG Bei, XU Ning, WANG Qiang
Chinese Journal of School Health 2025;46(7):932-936
Objective:
To investigate the indoor fine particulate matter (PM 2.5 ) pollution and its influencing factors in children s bedrooms using solid fuel, so as to provide evidence for effective strategy to reduce PM 2.5 pollution.
Methods:
From December 2019 to November 2020, 198 households (108 in the north, 90 in the south) from two pilots in the north(Jiamusi in Heilongjiang Province) and south of China (Mianyang in Sichuan Province) were selected, and status of solid fuels using were obtained through home visits, dynamic changes in PM 2.5 concentrations in children s bedrooms were monitored by using real time online instruments, and the influencing factors of PM 2.5 pollution were analyzed by using a mixed effects model.
Results:
During the monitoring period, the daily PM 2.5 concentrations in the northern and southern pilot were 78.33 (40.50, 154.80) and 38.54(26.20, 58.46) μg/m 3, respectively, exceeding standard rates of 44.57% and 33.22%. During the heating period, the daily PM 2.5 concentrations in the northern and southern pilot were 212.50(133.60,244.10) and 104.42(73.97, 134.90) μg/m 3, respectively, with over standard rates of 96.75% and 86.96%. The mixed effects model analysis results showed that children s bedroom PM 2.5 concentrations were associated with solid fuel usage duration, window opening time, room layout (shared entrance door between kitchen and bedroom), indoor smoking, indoor humidity, and solid fuel use in the bedroom ( β =0.19, -0.05, 1.20, 0.43, 0.02, 0.35, all P <0.05).
Conclusion
Solid fuel combustion significantly comtributes to PM 2.5 pollution in children s bedrooms, with more pronounced impacts observed in northern China compared to southern regions.
10.Intelligent handheld ultrasound improving the ability of non-expert general practitioners in carotid examinations for community populations: a prospective and parallel controlled trial
Pei SUN ; Hong HAN ; Yi-Kang SUN ; Xi WANG ; Xiao-Chuan LIU ; Bo-Yang ZHOU ; Li-Fan WANG ; Ya-Qin ZHANG ; Zhi-Gang PAN ; Bei-Jian HUANG ; Hui-Xiong XU ; Chong-Ke ZHAO
Ultrasonography 2025;44(2):112-123
Purpose:
The aim of this study was to investigate the feasibility of an intelligent handheld ultrasound (US) device for assisting non-expert general practitioners (GPs) in detecting carotid plaques (CPs) in community populations.
Methods:
This prospective parallel controlled trial recruited 111 consecutive community residents. All of them underwent examinations by non-expert GPs and specialist doctors using handheld US devices (setting A, setting B, and setting C). The results of setting C with specialist doctors were considered the gold standard. Carotid intima-media thickness (CIMT) and the features of CPs were measured and recorded. The diagnostic performance of GPs in distinguishing CPs was evaluated using a receiver operating characteristic curve. Inter-observer agreement was compared using the intragroup correlation coefficient (ICC). Questionnaires were completed to evaluate clinical benefits.
Results:
Among the 111 community residents, 80, 96, and 112 CPs were detected in settings A, B, and C, respectively. Setting B exhibited better diagnostic performance than setting A for detecting CPs (area under the curve, 0.856 vs. 0.749; P<0.01). Setting B had better consistency with setting C than setting A in CIMT measurement and the assessment of CPs (ICC, 0.731 to 0.923). Moreover, measurements in setting B required less time than the other two settings (44.59 seconds vs. 108.87 seconds vs. 126.13 seconds, both P<0.01).
Conclusion
Using an intelligent handheld US device, GPs can perform CP screening and achieve a diagnostic capability comparable to that of specialist doctors.


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