1. Research Unit for General Practice, Institute of Public Health, University of Southern Denmark, J. B. Winsloews Vej 9A, 5000 Odense, Denmark
2. Department of Endocrinology M, Odense University Hospital, Kløvervænget 64, 5000 Odense C, Denmark
3. Reduce - A Research Unit, Tempelvej 24, 4390 Vipperoed, Denmark
4. Institute of Health Policy, Management and Evaluation (IHPME), University of Toronto, M5T 3M, Canada
5. Human Nutrition Research Centre, School of Agriculture, Food & Rural Development, Newcastle University, Agriculture Building, Kings Road, Newcastle upon Tyne NE1 7RU, UK