1. Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
2. San Raffaele Telethon Institute for Gene Therapy, IRCCS Ospedale, San Raffaele, Milan,20132, Italy
3. Pediatric Immunohematology, IRCCS Ospedale San Raffaele, Milan, 20132, Italy
4. Newborn Screening, Clinical Chemistry, and Pharmacology Lab, Meyer Children’s Hospital, Florence, 50139, Italy
5. Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, 50121, Italy
6. Division of Neurology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, United States
7. Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
8. MLD Foundation, West Linn, Oregon 97068, United States
9. Department of Pediatrics, Duke University, Durham, North Carolina 27705, United States
10. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261, United States
11. MSD Action Foundation, Dublin, Ireland
12. United MSD Foundation, Ocean Springs, Misssissippi 39564, United States
13. Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States