1. State Key Laboratory of Reproductive Medicine; Nanjing Medical University; Nanjing, China
2. The authors consider that the first two authors should be regarded as joint First Authors.
3. Department of Gynecology; Nanjing Maternal and Child Health Hospital; Nanjing Medical University; Nanjing, China
4. State Key Laboratory of Reproductive Medicine; Center of Clinical Reproductive Medicine; First Affiliated Hospital; Nanjing Medical University; Nanjing, China