1. NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht University, PO Box 616, 6200 MD Maastricht, The Netherlands
2. Department of Health Promotion, Faculty of Health, Medicine and Life Sciences, PO Box 616, 6200 MD Maastricht, The Netherlands
3. Aarhuys University, Danish School of Education, Tuborgvej 164 DK-2400 Copenhagen NV, Denmark
4. CAPHRI School for Public Health and Primary Care, Maastricht University Medical Centre, PO Box 616, 6200 MD Maastricht, The Netherlands