1. Departments of Neurology; The University of Texas Health Science Center at Dallas; Dallas TX 75235 U.S.A.
2. Department of Pharmacology; The Milton S. Hershey Medical Center; The Pennsylvania State University; Hershey PA U.S.A.
3. Departments of Pharmacology; Southwestern Regional VA Epilepsy Center; Dallas TX 75235 U.S.A.