1 Department of Gynecology and Obstetrics, Reproductive Medical Center, Shanghai Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
2 Institute of Reproductive Medicine, School of Medicine, Nantong University, Nantong 226019, China.
3 Department of Andrology, Women and Children's Hospital, School of Medicine, Xiamen University, Xiamen 361005, China.