1. Reproductive Medicine Center, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School , Nanjing 210008 , People's Republic of China
2. Reproductive Medicine Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan 430030 , People's Republic of China
3. Department of Gynecology, Shangrao People's Hospital , 334099 Shangrao, People's Republic of China