[1] Leiden Univ, Dept Pulmonol, Med Ctr, Leiden, Netherlands
[2] Leiden Univ, Med Ctr, Dept Gastroenterol & Hepatol, Leiden, Netherlands
[3] Hannover Med Sch, Dept Resp Med, Biomed Res Endstage & Obstruct Lung Dis Hannover, German Ctr Lung Res DZL, Hannover, Germany
[4] Leiden Univ, Med Ctr, Dept Pulmonol, Leiden, Netherlands
[5] Dept Gastroenterol & Hepatol, Leiden, Netherlands