1. National Institute of Public Health and Environmental Protection Bilthoven
2. TNO Institute of Preventive Health Care Leiden
3. Juliana Children's Hospital The Hague
4. Spaarne Hospital Heemstede Heemstede
5. Department of Internal Medicine, Free University Hospital Amsterdam Amsterdam
6. Dutch Diabetes Association Amersfoort
7. Department of Pediatrics, Academic Hospital Rotterdam/Sophia Children/s Hospital Rotterdam, The Netherlands