1. Department of Public Health, Epidemiology, Biostatistics and Biodemography, University of Southern Denmark, Odense, Denmark
2. Department of Economics, Center for Research in Health and Economics (CRES), Pompeu Fabra University, Barcelona, Spain
3. Data Science in Health Services and Policy Research, Institute for Health Sciences in Aragón (IACS), Zaragoza, Spain
4. Spanish Health Services Research Network on Chronic Diseases (REDISSEC), Zaragoza, Spain
5. Department of Gastroenterology, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), CIBERehd, University of Barcelona, Barcelona, Spain