[1] Martin Luther Univ Halle Wittenberg, Dept Visceral Vasc & Endocrine Surg, Ernst Grube Str 40, D-06120 Halle, Germany
[2] North Shore Hosp, Dept Gen Surg, Auckland, New Zealand
[3] Tech Univ Munich, Rechts Isar Hosp, Dept Surg, Munich, Germany
[4] Koc Univ, Sch Med, Dept Surg, Istanbul, Turkey