Affiliation: | 1. Department of Nutrition and Dietetics, VU University Medical Centre, , Amsterdam, The Netherlands;2. Department of Gastroenterology and Hepatology, Red Cross Hospital, , Beverwijk, The Netherlands;3. Department of Gastroenterology, Small Bowel Unit, VU University Medical Centre, , Amsterdam, The Netherlands;4. Department of Clinical Chemical Laboratory, VU University Medical Centre, , Amsterdam, The Netherlands |