1.Research progress of artificial intelligence in the diagnosis, treatment and prognosis of retinal detachment
Bingxing LU ; Qianyin CHEN ; Jinglin ZHANG
International Eye Science 2025;25(3):434-439
The application of artificial intelligence(AI)in the medical field, particularly for predicting, diagnosing and treating retinal detachment(RD), has made remarkable achievements. This paper reviews the advancements in AI applications for RD across multiple dimensions, including predicting RD incidence, assessing surgical success rates, forecasting postoperative visual outcomes, and evaluating recurrence rates. In diagnostic support, AI technology has demonstrated significant value, especially in ophthalmic imaging, with applications in the intelligent analysis of ultra-wide-angle fundus photography, optical coherence tomography(OCT), ophthalmologic ultrasound images, and AI chatbots models. Furthermore, AI has proven uniquely beneficial in surgical decision-making, robotic-assisted surgical systems, and the assessment of surgical complications. This paper provides a comprehensive overview of the current state of AI applications in RD, underscoring its potential to address numerous challenges in clinical practice. It also explores existing limitations and offers insights into future directions for development in this field.
2.Research progress of artificial intelligence in the diagnosis, treatment and prognosis of retinal detachment
Bingxing LU ; Qianyin CHEN ; Jinglin ZHANG
International Eye Science 2025;25(3):434-439
The application of artificial intelligence(AI)in the medical field, particularly for predicting, diagnosing and treating retinal detachment(RD), has made remarkable achievements. This paper reviews the advancements in AI applications for RD across multiple dimensions, including predicting RD incidence, assessing surgical success rates, forecasting postoperative visual outcomes, and evaluating recurrence rates. In diagnostic support, AI technology has demonstrated significant value, especially in ophthalmic imaging, with applications in the intelligent analysis of ultra-wide-angle fundus photography, optical coherence tomography(OCT), ophthalmologic ultrasound images, and AI chatbots models. Furthermore, AI has proven uniquely beneficial in surgical decision-making, robotic-assisted surgical systems, and the assessment of surgical complications. This paper provides a comprehensive overview of the current state of AI applications in RD, underscoring its potential to address numerous challenges in clinical practice. It also explores existing limitations and offers insights into future directions for development in this field.
3.Development and application of fully automated intelligent intravenous medication dispensing robot ML300 in Pharmacy Intravenous Admixture Services
Guanyuan WANG ; Wenli LI ; Jinglin LIU ; Jie ZHANG
Chinese Journal of Tissue Engineering Research 2025;29(34):7362-7368
BACKGROUND:Dispensing robots have many advantages such as high accuracy,high efficiency,and ensuring a sterile environment,and are playing an increasingly important role in the medical field.OBJECTIVE:To investigate the development and application of ML300,a fully automated intelligent intravenous medication dispensing robot,in intravenous medication dispensing centers.METHODS:From June 1 to 30,2024,100 prescriptions of Pharmacy Intravenous Admixture Services of Tianjin Medical University Cancer Hospital containing three kinds of drugs:omeprazole sodium for injection,vitamin C injection,and magnesium isoglycyrrhizate were taken.According to the different methods of prescription configuration,they were divided into a control group(n=100)and an experimental group(n=100).The control group used an artificial simulated clinical work mode to prepare the above three drugs,and the operation was completed by several people;the experimental group used the fully automatic intelligent intravenous medication preparation robot ML300 to prepare the above three drugs,and the operation was completed by one person.The two groups were compared in terms of the dispensing efficiency,the amount of drug residue,the pass rate of insoluble particles,and the microbial detection rate in the configuration of the above three drugs.RESULTS AND CONCLUSION:The dispensing efficiency and pass rate of insoluble particles of the three drugs in the experimental group were higher than those of the control group(P<0.001),and the drug residue and microbial detection rate were lower than those of the control group(P<0.001).Taking Omeprazole Sodium for Injection,Vitamin C Injection,and Magnesium Isoglycyrrhizate as examples,ML300 can improve the dispensing efficiency and optimize the dispensing quality of Pharmacy Intravenous Admixture Services staffs.
4.Development and application of fully automated intelligent intravenous medication dispensing robot ML300 in Pharmacy Intravenous Admixture Services
Guanyuan WANG ; Wenli LI ; Jinglin LIU ; Jie ZHANG
Chinese Journal of Tissue Engineering Research 2025;29(34):7362-7368
BACKGROUND:Dispensing robots have many advantages such as high accuracy,high efficiency,and ensuring a sterile environment,and are playing an increasingly important role in the medical field.OBJECTIVE:To investigate the development and application of ML300,a fully automated intelligent intravenous medication dispensing robot,in intravenous medication dispensing centers.METHODS:From June 1 to 30,2024,100 prescriptions of Pharmacy Intravenous Admixture Services of Tianjin Medical University Cancer Hospital containing three kinds of drugs:omeprazole sodium for injection,vitamin C injection,and magnesium isoglycyrrhizate were taken.According to the different methods of prescription configuration,they were divided into a control group(n=100)and an experimental group(n=100).The control group used an artificial simulated clinical work mode to prepare the above three drugs,and the operation was completed by several people;the experimental group used the fully automatic intelligent intravenous medication preparation robot ML300 to prepare the above three drugs,and the operation was completed by one person.The two groups were compared in terms of the dispensing efficiency,the amount of drug residue,the pass rate of insoluble particles,and the microbial detection rate in the configuration of the above three drugs.RESULTS AND CONCLUSION:The dispensing efficiency and pass rate of insoluble particles of the three drugs in the experimental group were higher than those of the control group(P<0.001),and the drug residue and microbial detection rate were lower than those of the control group(P<0.001).Taking Omeprazole Sodium for Injection,Vitamin C Injection,and Magnesium Isoglycyrrhizate as examples,ML300 can improve the dispensing efficiency and optimize the dispensing quality of Pharmacy Intravenous Admixture Services staffs.
5.Huanglian Jiedu decoction combined with Xijiao Dihuang decoction for the treatment of psoriasis via influencing fibroblast activation-mediated keratinocyte proliferation: a mechanistic study
Youhua PENG ; Guiyun GAO ; Chao LIU ; Jinglin LI ; Mengyao ZHANG ; Jing DAI ; Yao CHEN ; Junqi LIU ; Xudong WANG
Chinese Journal of Dermatology 2025;58(11):1064-1074
Objective:To explore the mechanisms of action of Huanglian Jiedu decoction combined with Xijiao Dihuang decoction (HLJDT-XJDH) in regulating fibroblasts in the treatment of psoriasis. Methods:A mouse model of psoriasis was established by topical application of imiquimod 5% cream on the shaved back; HLJDT-XJDH at different doses of 7.7 and 30.6 g/kg was administered via gavage for intervention, and methotrexate (2 mg/kg) served as a positive control; after 7 days, the severity of skin lesions was assessed using the psoriasis area and severity index (PASI), while histopathological changes of skin tissues were evaluated using hematoxylin-eosin (HE) staining and Baker scoring. For in vitro experiments, fibroblasts were divided into a control group, a model group, a low-dose (5% drug-containing serum) intervention group, and a high-dose (20% drug-containing serum) intervention group; cells in the control group were cultured with 20% normal rat serum for 24 hours; in the model group, cells cultured with 20% normal rat serum were stimulated with 5 ng/ml tumor necrosis factor (TNF) -α and 50 ng/ml interleukin (IL) -17A for 24 hours to mimic fibroblasts during the occurrence of psoriasis; cells in the low- and high-dose intervention groups received the same stimulation as the model group, and were cultured for 24 hours with 5% and 20% HLJDT-XJDH-containing serum, respectively, but not with the 20% normal rat serum. After the above treatment, these cells were co-cultured with keratinocytes (HaCaT cells) using a Transwell system. In addition, on the basis of the control group, fibroblasts were divided into the model group, 20% drug-containing serum intervention group, and 20% drug-containing serum intervention + OE-SFRP2 group; TNF-α and IL-17A were used to stimulate the cells to simulate the psoriatic state; the treatment in the 20% drug-containing serum intervention group was carried out as previously described; in the 20% drug-containing serum intervention + OE-SFRP2 group, cells were transfected with the vector for 48 hours to establish an overexpression model, followed by culture with 20% drug-containing serum for 24 hours, without co-culture with HaCaT cells.. Cell counting kit-8 (CCK-8) assay was performed to assess cell viability, flow cytometry to measure apoptosis rates, enzyme-linked immunosorbent assay (ELISA) to detect levels of inflammatory cytokines (TNF-α, IL-1β, IL-6) as well as chemokine ligand (CXCL) 1 and CXCL12 in mouse serum or cell culture supernatant, qPCR to determine the mRNA expression of inflammatory cytokines, chemokines, cell cycle- and proliferation-related factors, as well as SFRP2 in mouse skin tissues or cells, and Western blot analysis to determine the protein expression of SFRP2, Wnt3a, and β-catenin in fibroblasts. One-way analysis of variance was employed for intergroup comparisons, and post-hoc analysis was conducted using Tukey's test. Results:In vivo mouse experiments showed that compared with the normal control group, the model group exhibited typical psoriatic characteristics in skin morphology, including significant inflammatory infiltration in skin tissues and marked epidermal thickening; compared with the normal control group, the serum levels of TNF-α (531.16 ± 28.27 pg/ml vs. 239.58 ± 10.39 pg/ml), IL-1β (111.40 ± 5.16 pg/ml vs. 80.35 ± 3.87 pg/ml), and IL-6 (109.17 ± 4.84 pg/ml vs. 71.73 ± 2.04 pg/ml) significantly increased in the model group, along with their mRNA expression levels in mouse skin tissues (all P < 0.001) ; compared with the model group, the treatment group showed alleviated psoriatic manifestations, and significant reductions in the levels of inflammatory factors TNF-α (low-dose, high-dose, and positive control groups: 420.80 ± 29.30 pg/ml, 322.33 ± 9.40 pg/ml, 322.97 ± 12.16 pg/ml, respectively), IL-1β (98.69 ± 4.49 pg/ml, 89.02 ± 1.56 pg/ml, 88.88 ± 2.08 pg/ml, respectively), and IL-6 (94.07 ± 3.76 pg/ml, 80.54 ± 3.30 pg/ml, 83.21 ± 3.18 pg/ml, respectively), as well as in their mRNA expression levels (all P < 0.001). In in vitro fibroblast experiments, compared with the control group, the model group exhibited a significant elevation in the supernatant levels of IL-1β (126.42 ± 3.56 pg/ml vs. 34.81 ± 0.44 pg/ml), IL-6 (459.44 ± 9.35 pg/ml vs. 115.51 ± 7.26 pg/ml), CXCL1 (2 434.88 ± 127.63 pg/ml vs. 762.85 ± 30.60 pg/ml) and CXCL12 (3 542.14 ± 35.86 pg/ml vs. 2 095.86 ± 45.12 pg/ml), the expression levels of their mRNAs (all P < 0.001), as well as the protein expression levels of SFRP2, Wnt3a, and β-catenin; after intervention with HLJDT-XJDH-containing serum, all the above indices significantly decreased (all P < 0.001). However, when 20% drug-containing serum intervention was administered simultaneously, the expression of inflammatory factors and chemokines in fibroblasts was significantly higher in the SFRP2 overexpression group than in the non-overexpression group (all P < 0.01). When fibroblasts were co-cultured with HaCaT cells, the model group showed significantly increased cell viability but a decreased apoptosis rate of HaCaT cells compared with the control group, while the low- and high-dose intervention groups showed significantly decreased cell viability but increased apoptosis rates of HaCaT cells compared with the model group (all P < 0.05) . Conclusion:HLJDT-XJDH may exert therapeutic effects in psoriasis by downregulating the SFRP2/Wnt/β-catenin signaling pathway, thereby inhibiting fibroblast activation and inflammatory process, which subsequently suppresses the proliferation of keratinocytes and the activation of inflammatory cells.
6.Huanglian Jiedu decoction combined with Xijiao Dihuang decoction for the treatment of psoriasis via influencing fibroblast activation-mediated keratinocyte proliferation: a mechanistic study
Youhua PENG ; Guiyun GAO ; Chao LIU ; Jinglin LI ; Mengyao ZHANG ; Jing DAI ; Yao CHEN ; Junqi LIU ; Xudong WANG
Chinese Journal of Dermatology 2025;58(11):1064-1074
Objective:To explore the mechanisms of action of Huanglian Jiedu decoction combined with Xijiao Dihuang decoction (HLJDT-XJDH) in regulating fibroblasts in the treatment of psoriasis. Methods:A mouse model of psoriasis was established by topical application of imiquimod 5% cream on the shaved back; HLJDT-XJDH at different doses of 7.7 and 30.6 g/kg was administered via gavage for intervention, and methotrexate (2 mg/kg) served as a positive control; after 7 days, the severity of skin lesions was assessed using the psoriasis area and severity index (PASI), while histopathological changes of skin tissues were evaluated using hematoxylin-eosin (HE) staining and Baker scoring. For in vitro experiments, fibroblasts were divided into a control group, a model group, a low-dose (5% drug-containing serum) intervention group, and a high-dose (20% drug-containing serum) intervention group; cells in the control group were cultured with 20% normal rat serum for 24 hours; in the model group, cells cultured with 20% normal rat serum were stimulated with 5 ng/ml tumor necrosis factor (TNF) -α and 50 ng/ml interleukin (IL) -17A for 24 hours to mimic fibroblasts during the occurrence of psoriasis; cells in the low- and high-dose intervention groups received the same stimulation as the model group, and were cultured for 24 hours with 5% and 20% HLJDT-XJDH-containing serum, respectively, but not with the 20% normal rat serum. After the above treatment, these cells were co-cultured with keratinocytes (HaCaT cells) using a Transwell system. In addition, on the basis of the control group, fibroblasts were divided into the model group, 20% drug-containing serum intervention group, and 20% drug-containing serum intervention + OE-SFRP2 group; TNF-α and IL-17A were used to stimulate the cells to simulate the psoriatic state; the treatment in the 20% drug-containing serum intervention group was carried out as previously described; in the 20% drug-containing serum intervention + OE-SFRP2 group, cells were transfected with the vector for 48 hours to establish an overexpression model, followed by culture with 20% drug-containing serum for 24 hours, without co-culture with HaCaT cells.. Cell counting kit-8 (CCK-8) assay was performed to assess cell viability, flow cytometry to measure apoptosis rates, enzyme-linked immunosorbent assay (ELISA) to detect levels of inflammatory cytokines (TNF-α, IL-1β, IL-6) as well as chemokine ligand (CXCL) 1 and CXCL12 in mouse serum or cell culture supernatant, qPCR to determine the mRNA expression of inflammatory cytokines, chemokines, cell cycle- and proliferation-related factors, as well as SFRP2 in mouse skin tissues or cells, and Western blot analysis to determine the protein expression of SFRP2, Wnt3a, and β-catenin in fibroblasts. One-way analysis of variance was employed for intergroup comparisons, and post-hoc analysis was conducted using Tukey's test. Results:In vivo mouse experiments showed that compared with the normal control group, the model group exhibited typical psoriatic characteristics in skin morphology, including significant inflammatory infiltration in skin tissues and marked epidermal thickening; compared with the normal control group, the serum levels of TNF-α (531.16 ± 28.27 pg/ml vs. 239.58 ± 10.39 pg/ml), IL-1β (111.40 ± 5.16 pg/ml vs. 80.35 ± 3.87 pg/ml), and IL-6 (109.17 ± 4.84 pg/ml vs. 71.73 ± 2.04 pg/ml) significantly increased in the model group, along with their mRNA expression levels in mouse skin tissues (all P < 0.001) ; compared with the model group, the treatment group showed alleviated psoriatic manifestations, and significant reductions in the levels of inflammatory factors TNF-α (low-dose, high-dose, and positive control groups: 420.80 ± 29.30 pg/ml, 322.33 ± 9.40 pg/ml, 322.97 ± 12.16 pg/ml, respectively), IL-1β (98.69 ± 4.49 pg/ml, 89.02 ± 1.56 pg/ml, 88.88 ± 2.08 pg/ml, respectively), and IL-6 (94.07 ± 3.76 pg/ml, 80.54 ± 3.30 pg/ml, 83.21 ± 3.18 pg/ml, respectively), as well as in their mRNA expression levels (all P < 0.001). In in vitro fibroblast experiments, compared with the control group, the model group exhibited a significant elevation in the supernatant levels of IL-1β (126.42 ± 3.56 pg/ml vs. 34.81 ± 0.44 pg/ml), IL-6 (459.44 ± 9.35 pg/ml vs. 115.51 ± 7.26 pg/ml), CXCL1 (2 434.88 ± 127.63 pg/ml vs. 762.85 ± 30.60 pg/ml) and CXCL12 (3 542.14 ± 35.86 pg/ml vs. 2 095.86 ± 45.12 pg/ml), the expression levels of their mRNAs (all P < 0.001), as well as the protein expression levels of SFRP2, Wnt3a, and β-catenin; after intervention with HLJDT-XJDH-containing serum, all the above indices significantly decreased (all P < 0.001). However, when 20% drug-containing serum intervention was administered simultaneously, the expression of inflammatory factors and chemokines in fibroblasts was significantly higher in the SFRP2 overexpression group than in the non-overexpression group (all P < 0.01). When fibroblasts were co-cultured with HaCaT cells, the model group showed significantly increased cell viability but a decreased apoptosis rate of HaCaT cells compared with the control group, while the low- and high-dose intervention groups showed significantly decreased cell viability but increased apoptosis rates of HaCaT cells compared with the model group (all P < 0.05) . Conclusion:HLJDT-XJDH may exert therapeutic effects in psoriasis by downregulating the SFRP2/Wnt/β-catenin signaling pathway, thereby inhibiting fibroblast activation and inflammatory process, which subsequently suppresses the proliferation of keratinocytes and the activation of inflammatory cells.
7.Preliminary Study on Prognostic Factors of New-onset Diabetes Mellitus After Distal Pancreatectomy for Pancreatic Cystic Tumor
Yuan LI ; Li ZHANG ; Jinglin LI ; Dianrong XIU ; Hangyan WANG
Chinese Journal of Minimally Invasive Surgery 2024;24(3):184-189
Objective To explore the prognostic factors of new-onset diabetes mellitus(NODM)in patients with pancreatic cystic tumor after distal pancreatectomy(DP).Methods Between January 2010 and December 2019,92 patients with cystic pancreatic tumors in our hospital underwent laparoscopic DP.According to the inclusion and exclusion criteria,a total of 74 cases were included and divided into NODM group or normal glucose metabolism group based on whether postoperative NODM occurred.A univariate analysis was used to evaluate the prognostic factors of laparoscopic DP for pancreatic cystic tumors.P<0.05 was considered statistically significant,OR>4 was considered as a potential prognostic factor of clinical significance for NODM.Results NODM was diagnosed in26 cases(35.1%),with a median diagnosis time of 9 months(range,3-56 months)after surgery.Univariate analysis showed that transecting pancreas in the neck(OR = 11.000,P = 0.000),BMI≥25.0(OR = 4.333,P = 0.007),and family history of diabetes mellitus(OR =5.000,P =0.004)were prognostic factors of postoperative NODM.Conclusions When performing DP for pancreatic cystic tumors,it is advisable to preserve as much pancreatic tissue as possible and avoid cutting off the pancreas in the neck.Precise postoperative strategy of glucose metabolism surveillance for patients with BMI≥25.0 and family history of diabetes mellitus should be promoted.
8.Construction and application evaluation of off-label drug use evaluation system in cancer hospital
Jinglin LIU ; Weiping WANG ; Hongtao WANG ; Ning GAO ; Chao ZHANG ; Xibei ZHOU ; Chunnuan WU ; Lu LU ; Jie ZHANG ; Xiaokun SONG
China Pharmacy 2024;35(17):2082-2087
OBJECTIVE To provide reference for strengthening the standardized management of off-label drug use in cancer hospitals. METHODS The evaluation system for off-label drug use was established to standardize the application, approval, and filing process for off-label drug use in our hospital. The changes in off-label drug application quantity, proportion, disease category and drug category in our hospital were compared before (October 1st, 2021-September 30th, 2022) and after (October 1st, 2022- September 30th, 2023) the establishment of the evaluation system; drug items supported by high-level evidence screened by pharmacy department were analyzed statistically. RESULTS The number of off-label drug use applications in our hospital had gradually increased, from 306 pieces in the fourth quarter of 2021 to 3 828 pieces in the third quarter of 2023. In the year before the construction of the evaluation system, there were a total of 4 482 applications for off-label drug use, and in the year after the construction of the evaluation system, there were 11 840 applications for off-label drug use. After the construction of the evaluation system, the proportion of unregistered off-label drug use significantly decreased, compared to the same period last year (P<0.05). Among them, there were no unregistered applications for off-label drug use for digestive system tumors, head and neck tumors, and radioactive drugs; lymphoma, breast tumors,urogenital system tumors, cytotoxic drugs and new anti-tumor drugs all had a decrease of over 70% in unregistered off-label drug applications. Twenty-seven off-label drug use items related to 19 drugs supported by high-level evidence were screened by the pharmacy department of our hospital, among which 25 items were drug use beyond indication. CONCLUSIONS The establishment of off-label drug use evaluation system in cancer hospital is helpful to the rational use and refined management of clinical anti-tumor drugs.
9.Analysis of image features of fundus blood vessel in healthy human eye based on deep learning techniques
Mengyu HUI ; Jinglin SHI ; Xiaohan YU ; Jian LI ; Yan ZHANG ; Zhengli TANG ; Shanghai YU ; Yue GAO ; Ping LIU ; Hua ZHANG
International Eye Science 2024;24(10):1542-1550
AIM:To explore the fundus vascular characteristics of healthy individuals based on deep learning techniques, with a view to discovering the range of normal values of the fundus arteries and veins, as well as the relationship between physiological factors, such as gender, age, body mass index(BMI), blood pressure, and fundus vasculature characteristics.METHODS:Fundus images of healthy people were taken from a professional fundus camera, and the subject's blood pressure and laboratory test was collected. Additionally, the fundus arteries and veins were segmented by the improved U-Net model, and the color, morphology and Haralick texture features of the vessels were extracted from computer vision technology.RESULTS:A total of 4 487 cases fundus images were taken and 326 cases with healthy and clear fundus images were screened, including 200 males and 126 females. There were differences in the morphology, color, and textural characteristics of the left and right eyes, as well as of the fundus arterioles and veins, with a mean vessel width(width)of 1.146 in the arteries and 1.430 in the veins, and an arteriovenous ratio about 4:5. Fundus artery and vein characteristics in healthy individuals of different ages(21-30, 31-40, 41-50): compared with the healthy population aged 21-30 and 31-40 years, arterial and venous inverse difference moment(idm), f12 and venous angular second moment(asm)values increased, and arterial and venous contrast(con), entropy(ent), difference entropy(den), and venous sum entropy(sen)values decreased in 41-50 years. Compared with the 21-30 years age group, arterial f12 values increased and venous con values decreased in 31-40 years(all P<0.05). Fundus vascular characteristics of healthy individuals of different sexes: compared with male, fundus arterial and venous sum average(sav), sum variance(sva)values, arterial curved values, and venous b mean, bsd, variance(var), sen, ent values increased in female, while venous area value of female decreased(all P<0.05). There were no statistically significant differences in fundus arteriosus and venous features in healthy subjects with different levels of BMI(all P>0.05). Fundus characteristics of healthy people with different degrees of blood pressure: there were statistically significant differences in fundus arteriosus area, width, and venous con, idm, dva, and den values between the normal blood pressure and high blood pressure groups(all P<0.05).CONCLUSION: The characteristics of the left and right eyes as well as the fundus arteries and veins differ in healthy individuals and correlate with physiological factors such as gender, age and blood pressure, which have the value of a potential microcirculation marker.
10.Occupational exposure limits for blue light in welding environments: Based on ICNIRP guidelines and human eye imaging principles
Jinglin SHANG ; Kai ZHANG ; Qing ZHOU
Journal of Environmental and Occupational Medicine 2024;41(11):1227-1231
Background Blue light, as an occupational hazard, is widely present in welding and related work environments. However, China's occupational health standard system has not yet established any limit for blue light exposure in welding work environments. Objective To study and propose blue light exposure limits in welding operation environments, and provide a reference for evaluation of blue light hazard and maximum allowable exposure time in welding operations. Methods A function between retinal irradiance and welding arc radiance was introduced by studying arc light and blue light radiation generated in welding operation environments, analyzing the incoherent light radiation protection guidelines issued by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), and combined with factors such as the size of arc light in welding operations, the distance between the welder's eyes and the arc light, and the diameter of the human eye pupil, as well as the geometric optics principle of human eye imaging and the conservation of energy. Then, the radiance limit (100 W·m−2·Sr−1) issued by ICNIRP was input into the above function to calculate the blue light irradiance exposure limit in the welding operation environments. Results The blue light irradiance exposure limit in the welding operation environments (

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