[1] Aventis Pharmaceut Inc, CNS Pharmacol, Bridgewater, NJ 08807 USA
[2] Massachusetts Gen Hosp, Dept Neurol, Neuroprotect Res Lab, Boston, MA 02114 USA
[3] Massachusetts Gen Hosp, Dept Radiol, Boston, MA 02114 USA
[4] Harvard Univ, Sch Med, Program Neurosci, Harvard, MA USA