1. Department of Urology, Peking University Shenzhen Hospital, Shenzhen, Guangdong 518036, P.R. China
2. Department of Urology, Anhui Medical University, Anhui, Hefei 230032, P.R. China
3. The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Shenzhen, Guangdong 518036, P.R. China
4. Department of Ultrasound, Peking University Shenzhen Hospital, Shenzhen, Guangdong 518036, P.R. China