1. Department of Reproduction; Nanjing Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University; Nanjing P. R. China
2. State Key Laboratory of Reproductive Medicine; Nanjing Medical University; Nanjing P. R. China
3. Central Laboratory; Wuxi Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University; Wuxi P. R. China