1. State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, China
2. Department of Reproductive Medicine, Maternal and Child Health Care Hospital of Nantong City, Nantong, China
3. Key Laboratory of Pathogen Biology of Jiangsu Province, Nanjing Medical University, Nanjing, China
4. Department of Microbiology, Nanjing Medical University, Nanjing, China