[1] Univ Hosp Gasthuisberg, Dept Gastroenterol, B-3000 Leuven, Belgium
[2] Univ Hosp Gasthuisberg, Dept Radiol, B-3000 Leuven, Belgium
[3] Univ Hosp Gasthuisberg, Dept Pathol, B-3000 Leuven, Belgium
[4] Univ Hosp Gasthuisberg, Dept Abdominal Surg, B-3000 Leuven, Belgium