1. Department of Medical Biochemistry, Immunology & Toxicology University Hospital Wales Cardiff UK
2. School of Medicine Cardiff University, University Hospital Wales Cardiff UK
3. Paediatric Metabolic Medicine Evelina Children's Hospital, Guys & St Thomas' NHSFT London UK
4. Department of Clinical Chemistry Sheffield Children's (NHS) FT Sheffield UK
5. MCA Laboratory, Queen Beatrix Hospital Winterswijk The Netherlands
6. Newborn Screening and Molecular Biology Branch Centers for Disease Control and Prevention Atlanta Georgia
7. Department of Child Health University Hospital Wales Cardiff UK
8. Biochemical Sciences Viapath, Guys & St Thomas' NHSFT London UK
9. GKT School of Medical Education, King's College London UK