1. Department of General Practice Intellectual Disability Medicine Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
2. Amarant Healthcare Organization for People with Intellectual Disabilities Tilburg The Netherlands
3. Division of Endocrinology Department of Internal Medicine Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
4. Department of Clinical Chemistry Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
5. Department of General Practice Erasmus MC, University Medical Center Rotterdam Rotterdam The Netherlands
6. Ipse de Bruggen Healthcare Organization for People with Intellectual Disabilities Zoetermeer The Netherlands