1. Department of Urology, The First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an 710049, China
2. Department of Urology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
3. Department of Urology, Shaanxi Provincial People's Hospital, Xi'an, Shaanxi 710068, P.R. China
4. Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555, USA
5. Department of Life Sciences, National Chung Hsing University, Taichung 40705, Taiwan
6. Graduate Institute of Cancer Biology, China Medical University Hospital, Taichung 40447, Taiwan