1. 1Internal Medicine, Division of Endocrinology, Erasmus MC, University Medical Centre Rotterdam, Rotterdam, the Netherlands
2. 2Department of Paediatrics, Subdivision of Endocrinology, Erasmus University Medical Centre, Rotterdam, the Netherlands
3. 3Academic Centre for Growth, Erasmus University Medical Centre, Rotterdam, the Netherlands
4. 4Dutch Growth Research Foundation, Rotterdam, the Netherlands
5. 5Diabeter, National Diabetes Care and Research Centre, Rotterdam, the Netherlands
6. 6Department of Paediatric Endocrinology, Leiden University Medical Centre, Leiden, the Netherlands