1. Shanghai JiaoTong University School of Medicine, Ruijin Hospital, Department of Urology, Shanghai, 200025 China
2. Department of Medicine, Division of Regenerative Medicine, University of California, San Diego, School of Medicine, La Jolla, CA, 92037 USA
3. Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, 44195 USA