1. School of Medicine, Zhejiang University, Hangzhou, Zhejiang, P. R. China
2. School of Clinical Medicine, Hangzhou Medical College, Hangzhou, Zhejiang, P. R. China
3. Department of Reproductive Endocrinology, Key Laboratory of Reproductive Genetics of National Ministry of Education, Women’s Reproductive Health Laboratory of Zhejiang Province, Women’s Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, P. R. China