1. National Health Commission Key Laboratory of Male Reproductive Health, Human Sperm Bank, National Research Institute for Family Planning, Beijing, China.
2. Institute of Pediatric Research, Children’s Hospital of Soochow University, Suzhou, China.
3. Key Laboratory of Reproductive Medicine of Hebei Provincial, Hebei Research Institute of Reproductive Health, Shijiazhuang, China.
4. Department of Pediatric Urology, Children’s Hospital of Soochow University, Suzhou, China.