1 Metabolic Laboratory, Department of Pathology and Laboratory Medicine, Hamad Medical Corporation, Doha P.O. Box 3050, Qatar; [email protected].
2 Newborn Screening Laboratory, Medical Genetic Unit, Faculty of Medicine, Saint Joseph University, B.P. Riad El Solh, Beirut 11-5076, Lebanon; [email protected].
3 Head Reference Laboratory for Neonatal Screening, Center for Health Protection, National Institute for Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA Bilthoven, The Netherlands; [email protected].
4 ISNS Office, 3721 CK Bilthoven, The Netherlands.