1. Dutch Reference Center for Prader-Willi Syndrome , 3016 AH Rotterdam , The Netherlands
2. Dutch Growth Research Foundation , 3016 AH Rotterdam , The Netherlands
3. Department of Pediatrics, Subdivision of Endocrinology, Erasmus University Medical Center-Sophia Children’s Hospital , 3015 CN Rotterdam , The Netherlands
4. Department of Pediatrics, Erasmus University Medical Center-Sophia Children’s Hospital , 3015 CN Rotterdam , The Netherlands
5. Department of Pediatrics, Leiden University Medical Center-Willem-Alexander Children’s Hospital , 2333 ZA Leiden , The Netherlands