[1] Krankenhaus Sachsenhausen, Dept Gen Surg, Frankfurt, Germany
[2] Krankenhaus Sachsenhausen, Ctr Minimal Invas Surg, Frankfurt, Germany
[3] Univ Giessen, Dept Gen & Thorac Surg, D-35390 Giessen, Germany
[4] Krankenhaus Sachsenhausen, Crohn Colitis Ctr Rhein Main, Frankfurt, Germany