[1] Leiden Univ, Med Ctr, Dept Immunol, Leiden, Netherlands
[2] Vrije Univ Amsterdam Amsterdam Gastroenterol Endoc, Dept Gastroenterol & Hepatol, Amsterdam UMC, Amsterdam, Netherlands
[3] Charite Univ Med Berlin, Div Gastroenterol Infect Dis & Rheumatol, Campus Benjamin Franklin, Berlin, Germany
[4] Vrije Univ Amsterdam, Amsterdam UMC, Amsterdam UMC locat, Lab Specialized Diagnost & Res,Dept Lab Med,Med Im, Amsterdam, Netherlands