[1] Univ Amsterdam, Dept Gastroenterol, Amsterdam Med Ctr, Acad Med Ctr, NL-1105 AZ Amsterdam, Netherlands
[2] Univ Amsterdam, Acad Med Ctr, Dept Surg, NL-1105 AZ Amsterdam, Netherlands
[3] Univ Amsterdam, Acad Med Ctr, Dept Clin Epidemiol Biostat & Bioinformat, NL-1105 AZ Amsterdam, Netherlands