[1] FREE UNIV BRUSSELS,IRIBHN,B-1070 BRUSSELS,BELGIUM
[2] FREE UNIV BRUSSELS,SERV GENET MED,B-1070 BRUSSELS,BELGIUM
[3] FREE UNIV BRUSSELS,SERV VIROL,B-1070 BRUSSELS,BELGIUM
[4] FREE UNIV BRUSSELS,SERV IMMUNODEFICIENCES,B-1070 BRUSSELS,BELGIUM
[5] UNIV PENN,DEPT PATHOL & LAB MED,PHILADELPHIA,PA 19104
[6] HOP COCHIN,INST COCHIN GENET MOL,F-75014 PARIS,FRANCE
[7] HOP ROBERT DEBRE,INSERM,U120,F-75935 PARIS,FRANCE
[8] UNIV LIEGE,BELGIAN AIDS REFERENCE LABS,B-4000 LIEGE,BELGIUM
[9] UNIV LIEGE,FAC VET MED,DEPT GENET,B-4000 LIEGE,BELGIUM
[10] NAGOYA UNIV,SCH MED,DEPT SURG 2,NAGOYA,AICHI 466,JAPAN
[11] UNIV PENN,DEPT MED,DIV PULM & CRIT CARE,PHILADELPHIA,PA 19104