[1] UNIV TORONTO,NATL CANC INST CANADA,EPIDEMIOL UNIT,MCMURRICH BLDG,TORONTO M5S 1A8,ONTARIO,CANADA
[2] ROYAL MARSDEN HOSP,SW THAMES REG CANC ORG,CANC SERV,SUTTON SM2 5PT,SURREY,ENGLAND
[3] INT AGCY RES CANC,BIOSTAT & FIELD STUDIES UNIT,F-69372 LYON 08,FRANCE
[4] UNIV TAMPERE,DEPT PUBL HLTH,SF-33101 TAMPERE 10,FINLAND
[5] NCI,DIV CANC PREVENT & CONTROL,BETHESDA,MD 20892