Objective To assess the safety and effectiveness of laparoscopically total extraperitoneal (TEP) repair using two mesh cross and overlap without stapler technique and to discuss the cause of main complications. Methods In this study 243 cases of inguinal hernia were randomly divided into two groups. One group underwent two meshes cross and overlap no fixation TEP, the other underwent a single mesh stapling fixation TEP. The average postoperative follow-up was ( 28 ± 6 ) months. For comparing the effect of the two approaches, statistical analysis including the χ2 test and Student's t test was carried out where appropriate. A p value of less than 0. 05 was considered statistically significant. Results The recurrence rate for the mesh no fixation group ( 1.9% ) did not increase when compared to mesh fixation group( 2. 9% ) ( P ＞ 0. 05 ). The overall postoperative complication rate or individual complication rate was not significantly different between the two groups. Conclusions Laparoscopically total extraperitonealrepair(TEP) using two mesh cross and overlap no fixation technique is safe and reliable.

Objective To evaluate the effect of applying sitting posture corrector on improving reading and writing posture of elementary school students， and provide scientific evidence for prevention and control of myopia in children and adolescents. Methods One elementary school each in urban and suburban areas of Shanghai was selected using a convenience sampling strategy. Furthermore， two classes each in Grade 3 and 4 were selected as the intervention group （282 students were included in the study）， and the other two classes each in Grades 3 and 4 were selected as the control group （294 students were included in the study）. Students in the intervention group used the sitting posture corrector in the classrooms for 4 months （from September 2020 to January 2021）， while those in the control group did not use the sitting posture corrector. Relevant data were collected before and after the intervention through a self-administered questionnaire and visual examination. Statistical analysis was performed using chi-square test and generalized estimating equation. Results Before the intervention， 13.5% （38/282） of students in the intervention group and 12.2% （36/294） in the control group had good reading and writing posture （ χ ² = 0.195， P >0.659）. After the intervention， 18.4% （52/282） of students in the intervention group had good reading and writing posture， which was higher than that （11.2%， 33/294） in the control group （ χ ²=5.957， P =0.015）. Before and after the intervention， there was no significant differences in the prevalence of myopia between students in the intervention and control groups （all P >0.05）. Generalized estimating equation analysis showed that students in the intervention group were 1.502 times more likely to have good reading and writing posture than those in the control group after the intervention （ P =0.043）. Conclusion Applying sitting posture corrector in schools could improve students' reading and writing posture.