[1] Univ Amsterdam, Acad Med Ctr, Dept Gastroenterol, NL-1105 AZ Amsterdam, Netherlands
[2] Univ Amsterdam, Acad Med Ctr, Dept Med Microbiol, NL-1105 AZ Amsterdam, Netherlands
[3] Univ Amsterdam, Acad Med Ctr, Dept Histopathol, NL-1105 AZ Amsterdam, Netherlands
[4] Univ Amsterdam, Acad Med Ctr, Dept Clin Epidemiol, NL-1105 AZ Amsterdam, Netherlands