1. Department of Gynecology and Obstetrics, West China Second University Hospital, Sichuan University, Chengdu, PR China
2. Department of Obstetrics and Gynecology, Key Laboratory of Birth Defects and Related Diseases of Women and Children, Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, PR China
3. Department of Gynecological Operative Room Nursing, West China Second University Hospital, Sichuan University, Chengdu, PR China