1. Department of Reproductive Endocrinology; Women's Hospital, Zhejiang University School of Medicine; Hangzhou, Zhejiang, China
2. The Key Laboratory of Reproductive Genetics, Ministry of Education, Zhejiang University; Hangzhou, Zhejiang, China
3. Department of Assisted Reproduction; Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; Shanghai, China
4. The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University; Shanghai, China