[1] IJsselland Hosp, Dept Gen Surg, NL-2900 AR Capelle aan den IJssel, Netherlands
[2] Leiden Univ, Med Ctr, Dept Gen Surg, Leiden, Netherlands
[3] IJsselland Hosp, Dept Internal Med, NL-2900 AR Capelle aan den IJssel, Netherlands
[4] IJsselland Hosp, Dept Gastroenterol, NL-2900 AR Capelle aan den IJssel, Netherlands