1. Department of Nephrology, Lishui Municipal Central Hospital, Lishui, Zhejiang 323000, P.R. China
2. Department of Abdominal Surgery, Ganzhou Tumor Hospital, Ganzhou, Jiangxi 341000, P.R. China
3. Department of Urology, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian 362000, P.R. China