1. Department of Endocrinology and Center of Expertise on Gender Dysphoria Amsterdam University Medical Center Amsterdam the Netherlands
2. Department of Pediatrics Zaans Medical Center Zaandam the Netherlands
3. Department of Endocrinology Amsterdam University Medical Center Amsterdam the Netherlands
4. Department of Internal Medicine Hospital St Jansdal Harderwijk/Lelystad the Netherlands
5. Division of Pediatric Endocrinology, Department of Pediatrics Ghent University Hospital Ghent Belgium