1. a Department of Health Sciences , VU University Amsterdam , Amsterdam, The Netherlands
2. b EMGO Institute for Health and Care Research, VU University Amsterdam , Amsterdam, The Netherlands
3. c Department of Epidemiology and Biostatistics, EMGO Institute for Health and Care Research , VU University Medical Center , Amsterdam, The Netherlands
4. d GfK Panel Services Benelux B.V. , Dongen, The Netherlands
5. e Unilever Food and Health Research Institute , Vlaardingen, The Netherlands
6. f Choices International Foundation , Brussels, Belgium
7. g National Institute for Public Health and the Environment (RIVM) , Bilthoven, The Netherlands