1. Health Services Research, Sciensano, Brussels, Belgium.
2. Department of Endocrinology, Onze-Lieve-Vrouw Hospital Aalst, Aalst, Belgium.
3. Department of Endocrinology, Diabetology and Metabolism, University of Antwerp-Antwerp University Hospital, Antwerp, Belgium.
4. Department of Endocrinology and Diabetes, Mouscron Hospital Centre, Mouscron, Belgium.
5. Department of Pediatrics, University Hospitals Leuven-KU Leuven, Leuven, Belgium.
6. Department of Development and Regeneration, KU Leuven, Leuven, Belgium.
7. Department of Pediatric Endocronology, University Hospitals de Namur-UC Louvain, Yvoir, Belgium.
8. Department of Endocrinology, University Hospitals Leuven-KU Leuven, Leuven, Belgium.