1. Folkhälsan Research Center, Public Health Research Program, Helsinki, Finland
2. Health Sciences, Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
3. Department of Public Health, University of Helsinki, Helsinki, Finland
4. Department of Public Health, University of Turku, Turku, Finland
5. School of Health and Education, University of Skövde, Skövde, Sweden