1. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht
2. Institute for Research in Extra Mural Medicine, VU University Medical Center Amsterdam, Amsterdam
3. National Centre for Epidemiology, Surveillance and Health Promotion, National Institute of Health, Rome, Italy
4. National Institute of Public Health, KTL, Helsinki
5. Department of Neurology and Neuroscience, Kuopio University, Kuopio, Finland
6. Division of Human Nutrition, Wageningen University, Wageningen, The Netherlands