[1] CANC CONTROL AGCY BRITISH COLUMBIA, VANCOUVER V5Z 3J3, BC, CANADA
[2] MANITOBA CANC TREATMENT & RES FDN, WINNIPEG, MANITOBA, CANADA
[3] ONTARIO CANC TREATMENT & RES FDN, TORONTO, ONTARIO, CANADA
[4] IMPERIAL CANC RES FUND, CANC EPIDEMIOL & CLIN TRIALS UNIT, OXFORD, ENGLAND
[5] FINNISH CANC REGISTRY, HELSINKI, FINLAND
[6] ALBERTA CANC BOARD, EDMONTON, ALBERTA, CANADA
[7] NORWEGIAN CANC REGISTRY, OSLO, NORWAY
[8] WESTON PK HOSP, SHEFFIELD, ENGLAND
[9] KAROLINSKA HOSP, S-10401 STOCKHOLM 60, SWEDEN
[10] NATL CANC REGISTRY, STOCKHOLM, SWEDEN
[11] CANC REGISTRY SLOVENIA, LJUBLJANA, YUGOSLAVIA
[12] UNIV BIRMINGHAM, CANC EPIDEMIOL RES UNIT, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND
[13] DANISH CANC REGISTRY, COPENHAGEN, DENMARK