1. Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510230, P.R. China
2. Nanshan College of Guangzhou Medical University, Guangzhou, Guangdong 511436, P.R. China
3. The First Clinical College of Guangzhou Medical University, Guangzhou, Guangdong 511436, P.R. China