1. Endocrine Laboratory, Department of Clinical Chemistry Amsterdam UMC location University of Amsterdam, Amsterdam Gastroenterology Endocrinology Metabolism Amsterdam The Netherlands
2. Reference Laboratory for Neonatal Screening, Center for Health Protection National Institute for Public Health and the Environment (RIVM) Bilthoven The Netherlands
3. Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry Amsterdam UMC Location University of Amsterdam, Amsterdam Neuroscience, Amsterdam Gastroenterology Endocrinology Metabolism Amsterdam The Netherlands
4. Department of Human Genetics Amsterdam UMC location University of Amsterdam, Amsterdam Reproduction & Development Amsterdam The Netherlands
5. Endocrine Laboratory, Department of Clinical Chemistry Amsterdam UMC location Vrije Universiteit Amsterdam, Amsterdam Gastroenterology Endocrinology Metabolism Amsterdam The Netherlands
6. Department for Vaccine Supply and Prevention Programs National Institute for Public Health and the Environment (RIVM) Bilthoven The Netherlands
7. Department of Pediatric Neurology Amsterdam UMC location University of Amsterdam, Amsterdam Leukodystrophy Center, Emma Children's Hospital, Amsterdam Neuroscience Amsterdam The Netherlands
8. Center for Population Screening National Institute for Public Health and the Environment (RIVM) Bilthoven The Netherlands