1. Department of Internal Medicine, Spaarne Gasthuis, Hoofddorp, The Netherlands
2. Department of Science, Spaarne Gasthuis, Haarlem and Hoofddorp, The Netherlands
3. Centre for Environment and Health, KU Leuven, Leuven, Belgium
4. IDEWE, External Service for Prevention and Protection at Work, Leuven, Belgium
5. Department of Epidemiology, School of Medinie in Kotawice, Medical University of Silesia, Katowice, Poland
6. University of Palermo, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, Palermo, Italy
7. Leuven Child and Health Institute, KU Leuven, Leuven, Belgium
8. Department of Development and Regeneration, KU Leuven, Leuven, Belgium