[1] Univ Amsterdam, Gastroenterol & Hepatol, Med Ctr, Amsterdam, Netherlands
[2] Res Inst Amsterdam Gastroenterol Endocrinol Metab, Amsterdam, Noord Holland, Netherlands
[3] Vrije Univ Amsterdam, Sch Med, Amsterdam, Netherlands
[4] Friedrich Alexander Univ Erlangen Nurnberg, Dept Med 1, Erlangen, Germany
[5] Zuyderland Med Ctr, Dept Gastroenterol Geriatr & Intens Care Med Co M, Geleen, Netherlands
[6] Univ Amsterdam, Gastroenterol & Hepatol, Med Ctr, NL-1081 HZ Amsterdam, Netherlands