1. 1Endocrinology Laboratory, Department of Clinical Chemistry, Amsterdam Gastroenterology & Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
2. 2Endocrinology Laboratory, Department of Clinical Chemistry, Amsterdam Gastroenterology & Metabolism, Amsterdam UMC, Vrije Universiteit, Amsterdam, the Netherlands
3. 3Reference Laboratory Neonatal Screening, Center for Health protection, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
4. 4Netherlands Organization for Applied Scientific Research TNO, Department of Child Health, Leiden, the Netherlands
5. 5Center for Population Screening, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
6. 6Department of Vaccine Supply and Prevention, National Institute for Public Health and the Environment, Bilthoven, the Netherlands
7. 7Division of Metabolic Disorders, Department of Pediatrics, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands
8. 8Department of Clinical Chemistry, Amsterdam UMC, Vrije Universiteit & University of Amsterdam, Amsterdam, the Netherlands
9. 9Department of Paediatric Endocrinology, Emma Children’s Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands