[1] NATL UNIV SINGAPORE, INST MOLEC & CELL BIOL, PAPILLOMAVIRUS BIOL LAB, SINGAPORE 0511, SINGAPORE
[2] INST PASTEUR HELLEN, ATHENS, GREECE
[3] SINGAPORE GEN HOSP, DEPT OBSTET & GYNECOL, SINGAPORE 0316, SINGAPORE
[4] LUDWIG INST CANC RES, BR-01509 SAO PAULO, BRAZIL
[5] BEATSON INST CANC RES, GLASGOW G61 1BD, SCOTLAND
[6] SAPPORO MED COLL, CANC RES INST, CHUO KU, SAPPORO, HOKKAIDO 060, JAPAN
[7] INST KLIN & MOLEK VIROL, W-8520 ERLANGEN, GERMANY
[8] DEUTSCH KREBSFORSCHUNGSZENTRUM, INST TUMORVIROL, W-6900 HEIDELBERG, GERMANY