1. From the Center for Lysosomal and Metabolic Diseases (M.J.M., J.J.A.v.d.D., A.T.v.d.P., J.M.P.v.d.H.), Department of Paediatrics, Erasmus University Medical Center, Rotterdam; Neurochemistry laboratory (E.A.J.W., C.T.), Department of Clinical Chemistry, Amsterdam Neuroscience, Amsterdam University Medical Centres, VU University, the Netherlands; Departments of Biomedizin and Neurology (E.A.J.W.), MS Center and Research Center for Clinical Neuroimmunology and Neuroscience (RC2NB), University Hospital...