1. Department of Urology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
2. Department of Nuclear Medicine, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
3. Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA
4. Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
5. Department of Orthopedics, Brigham and Women's Hospital, VA Boston Healthcare System, Harvard Medical School, Boston, Massachusetts 02115, USA
6. School of Network Education, Beijing University of Posts and Telecommunications, Hebei, Beijing 100088, P.R. China
7. Department of Clinical Medicine, China Medical University, Shenyang, Liaoning 110122, P.R. China