Received Oct 2, 1998. Received revised Jan 13, 1999. Accepted for publication Jan 13, 1999. From the Division of Child Neurology, University of Texas Southwestern Medical Center at Dallas (Dr Roach), Dallas, TX; the Division of Pediatric Neurology, University of Connecticut at Connecticut Children’s Medical Center (Dr DiMario), Hartford, CT; the Johnson Neurological Clinic (Dr Kandt), High Poin...