1. Genetic & Molecular Epidemiology Unit, Department of Clinical Sciences, Skåne University Hospital, Lund University, 205 02 Malmö, Sweden
2. Department of Nutrition, Harvard School of Public Health, Boston, MA 02115, USA
3. Genetic Epidemiology & Clinical Research Group, Section for Medicine, Department of Public Health & Clinical Medicine, Umeå University, 90186 Umeå, Sweden