1. Institute of Clinical Medicine University of Oslo Oslo Norway
2. Department of Paediatrics Vestfold Hospital Trust Tønsberg Norway
3. Department of Medical Biochemistry Vestfold Hospital Trust Tønsberg Norway
4. Department of Paediatrics, Clinical Sciences Lund Lund University Lund Sweden
5. Norwegian National Unit for Newborn Screening Oslo University Hospital Oslo Norway
6. Laboratory of Medical Biochemistry Innlandet Hospital Trust Lillehammer Norway
7. Department of Medical Biochemistry and Pharmacology Haukeland University Hospital Bergen Norway
8. Norwegian National Unit for Newborn Screening, Division of Paediatric and Adolescent Medicine Oslo University Hospital Oslo Norway