1. Department of Pediatric Endocrinology, Emma Children's Hospital, Academic Medical Centre, 1100 DE Amsterdam, The Netherlands.
2. Department of Pathobiology, Division of Pathology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.
3. Department of Radiotherapy, Laboratory of Endocrinology and Radiochemistry, Academic Medical Centre, Amsterdam, The Netherlands.
4. Department of Clinical Chemistry, Laboratory of Endocrinology and Radiochemistry, Academic Medical Centre, Amsterdam, The Netherlands.