1. Martini-Klinik Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany
2. Department of Urology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
3. Department of Statistics, University of Connecticut, Storrs
4. Department of Computer Science and Statistics, University of Rhode Island, Kingston
5. Chicago Prostate Cancer Center, Westmont, Illinois
6. Department of Radiation Oncology, Dana-Farber Cancer Institute, Brigham and Women’s Hospital, Boston, Massachusetts