Affiliation: | 1. Department of Obstetrics 2. & Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, China;3. & Gynecology, West China Second University Hospital, Sichuan University, Chengdu, China |