Gerald V Raymond1, Raphael Schiffmann2. 1. From the Department of Pediatrics and Neurology (G.V.R.), Division of Pediatric Neurology, Penn State Children's Hospital, Hershey, PA; and Institute of Metabolic Disease (R.S.), Baylor Scott & White Research Institute, Dallas, TX. graymond@pennstatehealth.psu.edu. 2. From the Department of Pediatrics and Neurology (G.V.R.), Division of Pediatric Neurology, Penn State Children's Hospital, Hershey, PA; and Institute of Metabolic Disease (R.S.), Baylor Scott & White Research Institute, Dallas, TX.