[1] Radboud Univ Nijmegen Med Ctr, Dept Surg, Nijmegen, Netherlands
[2] St Antonius Hosp, Dept Surg, Nieuwegein, Netherlands
[3] Univ Med Ctr Utrecht, Dept Surg, Utrecht, Netherlands
[4] Univ Amsterdam, Amsterdam UMC, Amsterdam Gastroenterol & Metab, Dept Surg, Meibergdreef 9,POB 22660, NL-1100 DD Amsterdam, Netherlands