1. Department of Urology, The First Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China;
2. Department of Radiology Oncology, The First Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi, China;
3. Department of Urology, Provincial hospital affiliated to Shandong University, Jinan, Shandong, China; and
4. Oncology Research Lab, Key Laboratory of Environment and Genes Related to Diseases, Ministry of Education, Xi'an, Shaanxi, China;
5. Department of Urology, University of Texas Southwestern Medical Center, Dallas, Texas