[1] JOHNS HOPKINS UNIV,SCH MED,DIV COMPARAT MED,BALTIMORE,MD 21205
[2] JOHNS HOPKINS UNIV,SCH MED,DEPT BIOL CHEM,BALTIMORE,MD 21205
[3] JOHNS HOPKINS UNIV,SCH MED,DEPT NEUROL,BALTIMORE,MD 21205
[4] JOHNS HOPKINS UNIV HOSP,SCH HYG & PUBL HLTH,BALTIMORE,MD 21205