1. Department of Neurology; The Johns Hopkins Hospital, Johns Hopkins University School of Medicine; Baltimore MD
2. Department of Neurology; Children's National Medical Center, George Washington University; District of Columbia
3. McKusick-Nathans Institute of Genetic Medicine, The Johns Hopkins Hospital, Johns Hopkins University School of Medicine; Baltimore MD
4. The Russell H. Morgan Department of Radiology and Radiological Sciences; The Johns Hopkins Hospital, Johns Hopkins University School of Medicine; Baltimore MD