[1] Univ Ulm, Dept Internal Med 1, D-7900 Ulm, Germany
[2] Tech Univ Munich, ZIEL Res Ctr Nutr & Food Sci, Munich, Germany
[3] Massachusetts Gen Hosp, Gastrointestinal Unit, Boston, MA 02114 USA
[4] Massachusetts Gen Hosp, Ctr Study Inflammatory Bowel Dis, Dept Med, Boston, MA 02114 USA
[5] Harvard Univ, Sch Med, Boston, MA USA