1. Department of Urology, Tianjin Institute of Urology, The Second Hospital of Tianjin Medical University, Tianjin 300211, P.R. China
2. Department of Urology, Binzhou Medical University Hospital, Binzhou, Shandong 256600, P.R. China
3. Department of Pathology, The People's Hospital of Liaocheng, Liaocheng, Shandong 252000, P.R. China
4. Department of Pathology, Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264000, P.R. China