1. Department of General, Visceral, and Transplantation Surgery, University Hospital of Heidelberg, Heidelberg, Germany
2. Department of Urology and Urological Surgery, University Medical Centre Mannheim, University of Heidelberg, Mannheim, Germany
3. Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
4. Department of Surgery, First Surgical Clinic, University of Medicine and Pharmacy, Cluj Napoca, Romania