1. Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
2. Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
3. Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge
4. Institute of Surgery, University of Gothenburg, Gothenburg, Sweden
5. Department of Surgery, University Hospital, Örebro, Sweden
6. Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden7Nordic School of Public Health, Gothenburg, Sweden