[1] UNIV ALBERTA,DEPT RADIOL,EDMONTON,ALBERTA,CANADA
[2] UNIV ALBERTA,DEPT MED,EDMONTON,ALBERTA,CANADA
[3] UNIV ALBERTA,DEPT PATHOL,EDMONTON,ALBERTA,CANADA
[4] CROSS CANC INST,EDMONTON,ALBERTA,CANADA
[5] ATOM ENERGY CANADA,MED BIOPHYS BRANCH,PINAWA,MANITOBA,CANADA
[6] UNIV ROCHESTER,ROCHESTER,NY 14627