1 Department of Gynecology and Obstetrics, West China Second Hospital, Sichuan University, Chengdu, PR China; Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, PR China.
2 Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, PR China; Department of Operation Room Nursing, West China Second University Hospital, Sichuan University/West China School of Nursing, Sichuan University, PR China. Electronic address: yuanqi_100@126.com.
3 Department of Gynecology and Obstetrics, West China Second Hospital, Sichuan University, Chengdu, PR China. Electronic address: jinkeli@scu.edu.cn.