[1] JOHNS HOPKINS UNIV,DEPT PHARMACOL,BALTIMORE,MD 21205
[2] JOHNS HOPKINS UNIV,DEPT EXPTL THERAPEUTICS,BALTIMORE,MD 21205
[3] JOHNS HOPKINS UNIV,DEPT PSYCHIAT,BALTIMORE,MD 21205
[4] JOHNS HOPKINS UNIV,DEPT BEHAV SCI,BALTIMORE,MD 21205
[5] ADDENBROOKES HOSP,DEPT NEUROL SURG & NEUROL,CAMBRIDGE,ENGLAND
[6] UNIV CAMBRIDGE,SCH MED,DEPT PHARMACOL,MRC NEUROCHEM PHARMACOL UNIT,CAMBRIDGE,ENGLAND