1. Department of Gastroenterology; University Hospital Basel; Basel; Switzerland
2. Division of Allergy and Immunology; Rady Children's Hospital; University of California, San Diego; San Diego; CA; USA
3. Nestlé Research Center; Lausanne; Switzerland
4. Division of Pathology and Laboratory Medicine; Cincinnati Children's Hospital Medical Center; Cincinnati; OH; USA
5. Northwestern University School of Medicine; Chicago; IL; USA
6. Department of Gastroenterology and Hepatology; University Hospital Lausanne; Lausanne; Switzerland
7. Department of Dermatology; University Hospital Bern; Bern; Switzerland
8. Institute of Pharmacology; University of Bern; Bern; Switzerland