1. State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
2. University of the Chinese Academy of Sciences, Beijing 100049, China
3. Department of Urology, Peking University Third Hospital, Beijing 100191, China
4. Department of Andrology, Peking University Third Hospital, Beijing 100191, China
5. Department of Reproductive Medicine Center, Peking University Third Hospital, Beijing 100191, China
6. Department of Human Sperm Bank, Peking University Third Hospital, Beijing 100191, China