1. Department of Andrology, Second Hospital of Dalian Medical University, Dalian 116000, China
2. Department of Urology, First Hospital of Dalian Medical University, Dalian 116000, China
3. Department of Neuroelectrophysiology, First Hospital of Dalian Medical University, Dalian 116000, China
4. Department of Andrology, Peking University First Hospital, Beijing 100191, China