Dis Colon Rectum 2016 Apr;59(4):281-90
1 Surgical Department, University Medical Centre Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany 2 Department for Medical Statistics, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany 3 Schwarzwald-Baar Hospital, Department of General and Visceral Surgery, Villingen-Schwenningen, Germany.