1. Department of Urology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
2. Department of Urology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
3. Department of Pathology and Laboratory Medicine, Indianapolis, IN 46202, USA
4. Department of Urology, Indiana University School of Medicine, Indianapolis, IN 46202, USA