1. State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu, China
2. Department of Veterinary Drug Supervision, Taiyuan, Shanxi, China
3. Wenxi Agriculture Committee, Yuncheng, Shanxi, China
4. Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
5. Department of Obstetrics and Gynecology, The Second Affiliated Hospital, Nanjing Medical University, Nanjing, Jiangsu, China
6. Nanjing Maternity and Child Health Care Hospital, Nanjing, Jiangsu, China