Authors’ contributions
RECRUITMENT
ZZL and YZL conceived the study. YSZ, LJ, BQ, HC, MBZ, XL, XHL, LXL, ZZL, and YZL participated in the study design, participants’ recruitment, and data collection. BQ, LXL, ZZL, and YZL contributed to teaching the standard surgery in practice to MBZ, XL, and XHL. YZL, MBZ, XL, and XHL contributed to the surgery. YSZ, LJ, and HC contributed to the data analysis and prepared the manuscript. The authors read and approved the final manuscript.