1. Department of Urology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P. R. China
2. Department of Urology, The Peoples Hospital of Hunan Province, First Affiliated Hospital of Hunan Normal University, Changsha, P. R. China
3. Department of Healthy Management, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, P. R. China