1. Itecra GmbH, Köln, Germany
2. Department of Pharmacology, Clinical Pharmacology Unit, University Hospital, University of Cologne, Köln, Germany
3. Institute of Applied Statistics, Bielefeld, Germany
4. Mediconomics GmbH, Hannover, Germany
5. Division of Pediatric Urology, Department of Urology, University Medical Center Mainz, Mainz, Germany