1. Department of Urology, Anqing First People's Hospital, Anqing, Anhui 246000, P.R. China
2. Department of Urology, The Second Hospital of Anhui Medical University, Hefei, Anhui 230032, P.R. China
3. Department of Nutrition and Food Safety, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu 211166, P.R. China