University of Hamburg-Eppendorf, Dept. of Surgery, Martinistr. 52, 20246 Hamburg, Germany;
Armed Forces Hospital, Surgical Clinic, Oberer Eselsberg 40, 89081 Ulm, Germany;
University of Hamburg-Eppendorf, Dept. of Surgery, Martinistr. 52, 20246 Hamburg, Germany;
University of Hamburg-Eppendorf, Dept. of Surgery, Martinistr. 52, 20246 Hamburg, Germany;
University of Hamburg-Eppendorf, Dept. of Surgery, Martinistr. 52, 20246 Hamburg, Germany;