[1] UNIV PERUGIA,POLICLIN MONTELUCE,MED CLIN,I-06100 PERUGIA,ITALY
[2] CATHOLIC UNIV LEUVEN,DEPT HUMAN BIOL,DIV HUMAN GENET,B-3000 LOUVAIN,BELGIUM
[3] CATHOLIC UNIV LEUVEN,DEPT MED RES,DIV HEMATOL,B-3000 LOUVAIN,BELGIUM
[4] CATHOLIC UNIV LEUVEN,DIV ONCOL,B-3000 LOUVAIN,BELGIUM
[5] CATHOLIC UNIV LOUVAIN,SERV HEMATOL,B-1200 BRUSSELS,BELGIUM
[6] CLIN UNIV MT GODINNE,SERV HEMATOL,YVOIR,BELGIUM
[7] ST JAN ZIEKENHUIS,DIENST HEMATOL,BRUGGE,BELGIUM
[8] UNIV FERRARA,INST EMATOL,I-44100 FERRARA,ITALY