1. Department of Urology, The Affiliated Hospital of Qingdao University, Qingdao, Shangdong 266003, P.R. China
2. Key Laboratory, Department of Urology and Andrology, The Affiliated Hospital of Qingdao University, Qingdao, Shangdong 266003, P.R. China
3. Operating Room, The Affiliated Hospital of Qingdao University, Qingdao, Shangdong 266003, P.R. China