1 Key Laboratory of Reproductive Genetics (Ministry of Education) and Department of Reproductive Endocrinology, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.
2 Key Laboratory of Reproductive Genetics (Ministry of Education) and Department of Reproductive Endocrinology, Women's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China; Birth Defect Control and Prevention Research Center of Zhejiang Province, Hangzhou, Zhejiang, China; International Science and Technology Cooperation Base of Reproductive Health of Zhejiang Province, Hangzhou, Zhejiang, China. Electronic address: zhangdan@zju.edu.cn.