1. Clinical Epidemiology Unit, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
2. Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
3. Chronic Disease Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland
4. Department of Surgery, Faculty of Medicine and Health, Örebro, Örebro University, Sweden
5. Institute of Health and Care Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden