[1] NOTRE DAME HOSP,DEPT NEUROSURG,DIV NEUROSURG,MONTREAL,QUEBEC,CANADA
[2] UNIV WESTERN ONTARIO HOSP,DEPT NEUROSURG,DIV NEUROSURG,LONDON N6A 5A5,ONTARIO,CANADA
[3] UNIV SASKATCHEWAN HOSP,DEPT NEUROSURG,DIV NEUROSURG,SASKATOON S7N 0W8,SASKATCHEWAN,CANADA
[4] VICTORIA GEN HOSP,DEPT NEUROSURG,DIV NEUROSURG,HALIFAX,NS,CANADA
[5] PLAINS HLTH CTR,DEPT NEUROSURG,DIV NEUROSURG,REGINA,SASKATCHEWAN,CANADA
[6] OTTAWA CIVIC HOSP,DEPT NEUROSURG,DIV NEUROSURG,OTTAWA K1Y 4E9,ONTARIO,CANADA
[7] UNIV ALBERTA HOSP,DEPT NEUROSURG,DIV NEUROSURG,EDMONTON T6G 2B7,ALBERTA,CANADA