Department of Clinical Medicine, University of Bergen, Bergen 5021, Norway. National Center for Functional Gastrointestinal Disorders, Department of Medicine, Haukeland University Hospital, Bergen 5021, Norway. Mohn Medical Imaging and Visualization Center, Department of Radiology, Haukeland University Hospital, Bergen 5021, Norway. Host-Microbe Interactions in Metabolic Health Laboratory, Principe Felipe Research Center, Valencia 46012, Spain. Microbial Ecology, Nutrition and Health Research Unit, Institute of Agrochemistry and Food Technology, National Research Council, Paterna-Valencia 46980, Spain.