1. Department of Urology, Shandong Provincial Hospital, Shandong University, Jinan 250012, China
2. Department of Andrology, Liaocheng People’s Hospital, Shandong University, Liaocheng 252000, China
3. Department of Urology, The Second Hospital of Shandong University, Jinan 250012, China
4. Department of Physiology, School of Basic Medical Sciences, Shandong University, Jinan 250012, China