[1] JOHNS HOPKINS UNIV,SCH MED,DEPT PATHOL,DIV COMPARAT MED,BALTIMORE,MD 21205
[2] JOHNS HOPKINS UNIV,SCH MED,DEPT NEUROL,DIV COMPARAT MED,BALTIMORE,MD 21205
[3] JOHNS HOPKINS UNIV,SCH MED,DEPT NEUROSCI,BALTIMORE,MD 21205
[4] UNIV ALBERTA,DEPT AGR,EDMONTON T6G 2E1,ALBERTA,CANADA
[5] UNIV ALBERTA,DEPT PATHOL,EDMONTON T6G 2E1,ALBERTA,CANADA
[6] UNIV MARYLAND,SCH MED,DEPT NEUROL,BALTIMORE,MD 21201
[7] UNIV MARYLAND,SCH MED,DEPT PATHOL,BALTIMORE,MD 21201
[8] UNIV MARYLAND,SCH MED,DEPT ANAT,BALTIMORE,MD 21201