1 Division of Family Medicine, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden olov.rolandsson@umu.se.
2 Division of Metabolism, Endocrinology and Nutrition, Department of Medicine, University of Washington, Seattle, WA.
3 Division of Family Medicine, Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden.
4 MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine, Institute of Metabolic Science, Cambridge Biomedical Campus, Cambridge, U.K.