[1] RWTH Aachen Univ, Dermatol & Allergol, Aachen, Germany
[2] RWTH Univ, Fac Med, Dept Gastroenterol Hepatol & Hepatobiliary Oncol, Dept Med 3, Aachen, Germany
[3] Wageningen Univ, Nutr Metab & Genom Grp, Div Human Nutr & Hlth, Wageningen, Netherlands