[1] Univ Hosp Leuven, Dept Gastroenterol & Hepatol, Leuven, Belgium
[2] Katholieke Univ Leuven, Dept Chron Dis Metab & Ageing, Translat Res Ctr Gastrointestinal Disorders TARGI, Leuven, Belgium
[3] Earlham Inst, Norwich, Norfolk, England
[4] Quadram Inst, Norwich, Belgium
[5] Katholieke Univ Leuven, Dept Microbiol & Immunol, Lab Clin Immunol, Leuven, Belgium
[6] Katholieke Univ Leuven, Dept Human Genet, Lab Complex Genet, Leuven, Belgium