1University Hospitals Leuven & Department of Pharmaceutical and Pharmacological Sciences, Department of Pharmacy, Leuven, Belgium, 2Research Centre for Pharmaceutical Care and Pharmacoeconomics, Department of Pharmaceutical and Pharmacological Sciences, Leuven, Belgium, 3University Hospitals, Department of Gastroenterology, Leuven, Belgium, 4School of Public Health, Centre for Health Services and Nursing Research, Leuven, Belgium, 5Western Norway Research Network on Integrated Care, Helse Fonna, Haugesund, Norway, 6St Orsola-Malpighi Hospital, University of Bologna, Center for Chronic Intestinal Failure, Department of Gastroenterology and Internal Medicine, Bologna, Italy, 7Erasme University Hospital, Department of Gastroenterology, Brussels, Belgium, 8KTB Tumor Biology Center at Albert-Ludwigs-University, Gastroenterology and Nutrition Service, Freiburg, Germany, 9Hospital General Universitario Gregorio Marañón, Nutrition Unit, Madrid, Spain, 10Charité University Hospital, Humboldt-University, Department of Surgery, Berlin, Germany, 11University of Milan, Milan, Italy