1. Department of Paediatrics & Nutrition and Toxicology Research Institute Maastricht (NUTRIM); Maastricht University Medical Centre; Maastricht; the Netherlands
2. Small Bowel Unit; Department of Gastroenterology and Hepatology; VU University Medical Centre; Amsterdam; the Netherlands
3. Department of Methodology and Statistics; Maastricht University; Maastricht; the Netherlands
4. Laboratory of Clinical Immunology; Maastricht University Medical Centre; Maastricht; the Netherlands
5. Department of Pathology; VU University Medical Centre; Amsterdam; the Netherlands
6. Department of General Surgery; Maastricht University Medical Centre; Maastricht; the Netherlands
7. Department of Pathology; Maastricht University Medical Centre; Maastricht; the Netherlands
8. Department of Gastroenterology and Hepatology; Maastricht University Medical Centre; Maastricht; the Netherlands