1. NHC Key Lab of Reproduction Regulation (Shanghai Institute for Biomedical & Pharmaceutical Technologies), Medical School, Fudan University, Shanghai 200032, China
2. Department of Family Planning, Maternal & Child Health Care Hospital of Xinjiang Uygur Autonomous Region, Xinjiang 830001, China
3. Hami Central Hospital, Xinjiang Medical University, Xinjiang 830099, China
4. Chongqing Health Center for Women & Children, Chongqing 400010, China