1 Department of Surgery, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany; Department of General and Visceral Surgery, Ulm University Hospital, Ulm, Germany.
2 Department of Surgery, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany.
3 Department of Surgery, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Heidelberg University, Mannheim, Germany; Department of General and Visceral Surgery, Ulm University Hospital, Ulm, Germany. Electronic address: nuh.rahbari@umm.de.