Affiliation: | (1) Neurology Service, Pediatric Service, and Amino Acid Disorder Laboratory, Massachusetts General Hospital, USA;(2) Department of Neurology, Harvard Medical School, Boston, Massachusetts, USA;(3) Neurological Service P.C., Framingham, Massachusetts, USA;(4) Neurology Department, St. Elizabeth's Medical Center, Brighton, Massachusetts, USA;(5) Biochemical Genetics and Metabolism Laboratories, University of Minnesota Hospital and Clinic, Minneapolis, Minnesota, USA |