Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki University Hospital, Helsinki, Finland; Endocrinology, Abdominal Center, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland. Electronic address: niina.matikainen@hus.fi. Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki University Hospital, Helsinki, Finland. Department of Molecular and Clinical Medicine/Wallenberg Laboratory, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden. Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki University Hospital, Helsinki, Finland; Institute for Molecular Medicine FIMM, Helsinki, Finland; Department of Public Health, University of Helsinki, Helsinki, Finland. Research Programs Unit, Diabetes and Obesity, University of Helsinki, Helsinki University Hospital, Helsinki, Finland; Endocrinology, Abdominal Center, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland. Radiology, HUS Medical Imaging Center, Helsinki University Hospital, University of Helsinki, Finland. Department of Clinical Medicine and Surgery, Federico II University, Naples, Italy. Biostructure and Bioimaging Institute, National Research Council, Naples, Italy. Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec City, Québec, Canada. NNF Centre for Basic Metabolic Research, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.