[1] Marien Hosp, Dept Visceral Minimally Invas & Oncol Surg, Dusseldorf, Germany
[2] Univ Witten Herdecke, Helios Univ Hosp Wuppertal, Chair Surg 2, Dept Gen & Visceral Surg, Witten, Germany
[3] Univ Witten Herdecke, Helios Univ Hosp Wuppertal, Witten, Germany
[4] Univ Witten Herdecke, Helios Univ Hosp Wuppertal, Chair Surg 2, Ctr Hereditary Gastrointestinal Tumors, Witten, Germany