1. Department of Psychology, Reykjavik University, Reykjavik, Iceland.
2. Icelandic Centre for Social Research and Analysis, Reykjavik University, Reykjavik, Iceland.
3. Department of Health and Behavior Studies, Teachers College, Columbia University, New York, New York.
4. Department of Sociomedical Sciences, Mailman School of Public Health, Columbia University, New York, New York.