[1] NATL CANC INST CANADA,EPIDEMIOL UNIT,TORONTO M5S 2V7,ONTARIO,CANADA
[2] MCGILL UNIV,DEPT EPIDEMIOL & HLTH,MONTREAL H3A 2T5,QUEBEC,CANADA
[3] UNIV CINCINNATI,DEPT RADIOL,CINCINNATI,OH 45221
[4] VIRGINIA MASON MED CTR,DEPT RADIOL,SEATTLE,WA 98101
[5] UNIV LAVAL,DEPT RADIOL,QUEBEC CITY G1K 7P4,QUEBEC,CANADA
[6] UNIV ALBERTA,DEPT RADIOL,EDMONTON T6G 2E1,ALBERTA,CANADA
[7] UNIV TORONTO,DEPT RADIOL,TORONTO M5S 1A1,ONTARIO,CANADA
[8] UNIV MONTREAL,DEPT RADIOL,MONTREAL H3C 3J7,QUEBEC,CANADA
[9] UNIV MANITOBA,DEPT RADIOL,WINNIPEG R3T 2N2,MANITOBA,CANADA
[10] UNIV BRITISH COLUMBIA,DEPT RADIOL,VANCOUVER V6T 1W5,BC,CANADA