1. Department of Clinical Genetics, Leiden University Medical Centre, Leiden, Netherlands
2. Department of Human Genetics, McGill University, Montreal, Quebec, Canada
3. Department of Clinical Genetics, Radboud University Medical Centre, Nijmegen, Netherlands
4. Department of Pediatrics, Leiden University Medical Centre, Leiden, Netherlands
5. Department of Internal Medicine, Division of Endocrinology, Medical Spectrum Twente, Enschede, Netherlands
6. Department of Pediatric Endocrinology and Rheumatology, Karol Jonscher's Clinical Hospital, Poznan University of Medical Sciences, Poznan, Poland
7. Department of Pathology, Leiden University Medical Centre, Leiden, Netherlands
8. Department of Medical Genetics, Utrecht University Medical Center, Utrecht, Netherlands
9. Princess Maxima Center for Pediatric Oncology, Utrecht, Netherlands