1. Department of Andrology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
2. Reproductive Centre, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
3. Guangdong Provincial Key Laboratory of Orthopedics and Traumatology, Guangzhou, China.
4. Department of Urology, Southern Medical University Affiliate Dongguan People's Hospital, Dongguan, China.
5. Gastrointestinal Diseases Research Institute of Guangdong Province, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.