[1] ROYAL MELBOURNE HOSP,PARKVILLE,VIC 3050,AUSTRALIA
[2] VET ADM MED CTR,MINNEAPOLIS,MN 55417
[3] UNIV NOTTINGHAM HOSP,DEPT SURG,NOTTINGHAM NG7 2UH,ENGLAND
[4] ODENSE UNIV HOSP,DK-5000 ODENSE,DENMARK
[5] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598
[6] UNIV MICHIGAN,SCH PUBL HLTH,DEPT EPIDEMIOL,ANN ARBOR,MI 48109
[7] NN PETROV ONCOL RES INST,LENINGRAD 188646,USSR