1. Division of Child and Adolescent Psychiatry, Department of Psychiatry and Behavioral Sciences, Stony Brook University Medical Center, Stony Brook, New York,
2. Department of Neurology, North Shore-LIJ Health System, New Hyde Park, New York
3. Department of Psychiatry and Behavioral Sciences, Stony Brook University Medical Center, Stony Brook, New York
4. National Pediatric Multiple Sclerosis Center, Stony Brook University Medical Center, Stony Brook, New York
5. Department of Neurology, New York University Medical Center, New York
6. Vedanta Associates, Inc, Chapel Hill, North Carolina
7. L. L. Thurstone Psychometric Laboratory, University of North Carolina at Chapel Hill, North Carolina