1. Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
2. Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
3. Department of Epidemiology and Global Health, Umeå University, Umeå, Sweden
4. School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden