[1] ROYAL FREE HOSP,DEPT HAEMATOL,LONDON NW3 2QG,ENGLAND
[2] ROYAL FREE HOSP,DEPT IMMUNOL,LONDON NW3 2QG,ENGLAND
[3] WESTERN INFIRM,DEPT HAEMATOL,GLASGOW G11 6NT,SCOTLAND
[4] POLICLIN BORGA ROMA,HAEMATOL SECT,VERONA,ITALY
[5] POLICLIN BORGA ROMA,INST PATHOL,VERONA,ITALY