1. Department of Gynecology and Obstetrics; West China Second University Hospital, Sichuan University; Chengdu China
2. West China School of Preclinical and Forensic Medicine; Sichuan University; Chengdu China
3. Key Laboratory of Birth Defects and Related Diseases of Women and Children; Sichuan University, Ministry of Education; Chengdu China
4. Independent Scholar; Washington DC USA