Vincent Bos
Deptartment of Gastroenterology and Hepatology, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Femke Crouwel
Dept. of Gastroenterology and Hepatology, AGEM Research Institute, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Petra Waaijenberg
Deptartment of Gastroenterology and Hepatology, AGEM Research Institute, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Gerd Bouma
Deptartment of Gastroenterology and Hepatology, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Marjolijn Duijvestein
Deptartment of Gastroenterology and Hepatology, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam; Department of Gastroenterology and Hepatology, Radboud University Medical Centre, Nijmegen, The Netherlands

Hans J.C. Buiter
Department of Clinical Pharmacology and Pharmacy, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Henk S Brand
Department of Oral Biochemistry, Academic Centre for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands

Henrike M Hamer
Department of Clinical Chemistry, Amsterdam University Medical Centre, AGEM Research Institute, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands

Nanne K de Boer
Deptartment of Gastroenterology and Hepatology, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands