[1] UNIV GLASGOW,DEPT VET PATHOL,LEUKAEMIA RES FUND VIRUS CTR,GLASGOW G61 1QH,LANARK,SCOTLAND
[2] UNIV LIVERPOOL,DEPT MED MICROBIOL & GENITOURINARY MED,MOL VIROL GRP,LIVERPOOL L69 3BX,MERSEYSIDE,ENGLAND
[3] UNIV LEEDS,DEPT HAEMATOL,LEEDS,W YORKSHIRE,ENGLAND
[4] WESTERN INFIRM & ASSOCIATED HOSP,DEPT HAEMATOL,GLASGOW,LANARK,SCOTLAND