[1] WESTERN PROV BLOOD TRANSFUS SERV,HOWARD PL 7450,SOUTH AFRICA
[2] NATL INST VIROL,JOHANNESBURG 2131,SOUTH AFRICA
[3] UNIV CAPE TOWN,DEPT MED,LIVER RES UNIT,CAPE TOWN 7925,SOUTH AFRICA
[4] UNIV WITWATERSRAND,DEPT MED,JOHANNESBURG 2193,SOUTH AFRICA
[5] MED UNIV S AFRICA,DEPT VIROL,MEDUNSA 0204,SOUTH AFRICA
[6] UNIV CAPE TOWN,GROOTE SCHUUR HOSP,MRC,LIVER RES CTR,OBSERVATORY 7925,CAPE TOWN,SOUTH AFRICA