1. Department of Urology, Wuming Hospital of Guangxi Medical University, Nanning, Guangxi 530199, P.R. China
2. Department of Urology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi 530021, P.R. China
3. Division of General Practice, Community Healthcare Center of Zhongshan Torch Development Zone, Zhongshan, Guangdong 528437, P.R. China