1. Institute of Pathology; University Medical Center Hamburg-Eppendorf; Hamburg; Germany
2. Department of Urology; University Medical Center Hamburg-Eppendorf; Hamburg; Germany
3. Department of Urology; Clinical Center Itzehoe; Itzehoe; Germany
4. Department of Urology; German Armed Forces Hospital; Hamburg; Germany
5. Department of Urology; Regio Clinic Wedel; Wedel; Germany
6. Institute of Pathology; Cantonal Hospital Basel; Basel; Switzerland