1. Reproductive Medicine Center, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai, China
2. Department of Obstetrics and Gynecology, Jiaxing Maternity and Child Health Care Hospital, College of Medicine, Jiaxing University, Jiaxing, China
3. International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China