[1] UNIV CHICAGO, DEPT RADIAT & CELLULAR ONCOL, CHICAGO, IL 60637 USA
[2] ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA
[3] PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA
[4] PACIFIC NW LAB, DEPT HLTH PHYS, RICHLAND, WA 99352 USA
[5] UNIV CALIF LOS ALAMOS SCI LAB, GENET GRP, LOS ALAMOS, NM 87545 USA
[6] CASE WESTERN RESERVE UNIV, DEPT RADIOL, CLEVELAND, OH 44106 USA