[1] Med Univ Graz, Sect Surg Res, Graz, Austria
[2] Klin Donaustadt, Vienna Healthcare Grp, Dept Surg, Vienna, Austria
[3] Acad Hosp Goettingen Univ, Dept Gen Visceral & Thorac Surg, Klinikum Hanoversch Muenden, Vogelsang 10, D-34346 Hanoversch Muenden, Germany