Norwegian Institute of Public Health, Norwegian Institute of Public Health - Centre for Epidemic Interventions Research (CEIR), Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health, Norwegian Institute of Public Health - Centre for Epidemic Interventions Research (CEIR) and Norwegian Institute of Public Health

Karolinska Institutet, University of Oslo, Karolinska Institutet, Aalborg University - Center for Molecular Prediction of Inflammatory Bowel Disease (PREDICT), Aalborg University, Aarhus University - Aarhus University Hospital, Karolinska Institutet - Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, University of Stavanger - Stavanger University Hospital, University of Oslo - Clinical Effectiveness Research Group, Norwegian Institute of Public Health, University of Oslo - Clinical Effectiveness Group and Karolinska Institutet