1. Department of Public Health; University of Helsinki; Helsinki Finland
2. Department of Social Research; University of Helsinki; Helsinki Finland
3. Institute for Molecular Medicine (FIMM); University of Helsinki; Helsinki Finland
4. Department of Health; National Institute for Health and Welfare; Helsinki Finland
5. Department of Public and Occupational Health; VU University Medical Center; Amsterdam The Netherlands
6. Department of Biological Psychology; VU University Amsterdam; Amsterdam The Netherlands
7. EMGO Institute for Health and Care Research; VU University Medical Center; Amsterdam The Netherlands
8. Department of Health Sciences; University of Jyvaskyla; Jyvaskyla Finland