1 Health Promotion Research, Copenhagen University Hospital-Steno Diabetes Center Copenhagen, Borgmester Ib Juuls Vej 83, 2730 Herlev, Denmark.
2 National Institute of Public Health, University of Southern Denmark, Studiestræde 6, 1455 Copenhagen K, Denmark.
3 SA MRC Developmental Pathways for Health Research Unit, Faculty of Health Sciences, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein 2000, Johannesburg, South Africa.
4 The University of Sydney School of Public Health, Edward Ford Building, A27 Fisher Rd, University of Sydney NSW 2006, Australia.
5 Department of psychology and neuroscience, Dalhousie University, 1355 Oxford St, Halifax, NS B3H 4J1, Canada.
6 Department of Public Health, University of Copenhagen, Øster Farimagsgade 5, 1353 Copenhagen K, Denmark.