[1] KAROLINSKA INST,MED NOBEL INST,DEPT MED CELL GENET,S-10401 STOCKHOLM 60,SWEDEN
[2] HUDDINGE HOSP,DEPT CLIN IMMUNOL,S-14186 HUDDINGE,SWEDEN
[3] KAROLINSKA INST,DEPT RADIOL,S-10401 STOCKHOLM 60,SWEDEN
[4] KAROLINSKA INST,DEPT MED,DIV CLIN HEMATOL & ONCOL,S-10401 STOCKHOLM 60,SWEDEN