1. Department of Urology The Affiliated Hospital of Qingdao University Qingdao China
2. Department of Reproductive Medicine The Affiliated Hospital of Qingdao University Qingdao China
3. Department of Education and Training The Affiliated Hospital of Qingdao University Qingdao China
4. National Health and Family Planning Key Laboratory of Male Reproductive Health Department of Male Clinical Research National Research Institute for Family Planning Beijing
5. Graduate School of Peking Union Medical College Beijing China