[1] EPIDEMIOL UNIT,FLORENCE,ITALY
[2] NATL INST CANC RES,GENOA,ITALY
[3] CTR STUDY & CANC PREVENT,DESCRIPT EPIDEMIOL UNIT,FLORENCE,ITALY
[4] CANADA STAT,CANADIAN CTR HLTH INFORMAT,OTTAWA,ON,CANADA
[5] INT AGCY RES CANC,DESCRIPT EPIDEMIOL UNIT,F-69372 LYON,FRANCE