[1] Univ Maryland, Sch Med, Dept Pharmacol & Expt Therapeut, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Dept Neurol, Baltimore, MD 21201 USA
[3] VA Maryland Hlth Care Syst, Serv Neurol, Baltimore, MD USA
[4] VA Maryland Hlth Care Syst, Res Serv, Baltimore, MD USA
[5] Univ New Mexico, Sch Med, Dept Neurol, Albuquerque, NM 87131 USA
[6] Univ New Mexico, Sch Med, Dept Neurosci, Albuquerque, NM 87131 USA
[7] Univ New Mexico, Sch Med, Dept Cell Biol & Physiol, Albuquerque, NM 87131 USA