1. From Amsterdam University Medical Centers, University of Amsterdam, Departments of Clinical Chemistry, Pediatrics, and Clinical Genetics, Emma Children’s Hospital, Amsterdam Gastroenterology and Metabolism (A.B.P.K., R.L., J.K., J. Meijer, L.A.T., M.T., M.W., R.J.A.W., H.R.W., C.D.M.K.), and United for Metabolic Diseases (A.B.P.K., R.J.A.W., H.R.W., C.D.M.K.), Amsterdam, and the Department of Neurology, Brain Center Rudolf Magnus, University Medical Center Utrecht (J.J.F.A.V., J.H.V.), and the Project...