1. Andrology Laboratory, West China Hospital, Sichuan University, Chengdu, China
2. Department of Urology, West China Hospital, Sichuan University, Chengdu, China
3. Department of Epidemiology and Health Statistics, School of Public Health and Management, Chongqing Medical University, Chongqing, China
4. Laboratory of Innovation, Basic Medical Experimental Teaching Centre, Chongqing Medical University, Chongqing, China