[1] FAC MED ALEXIS CARREL,EPIDEMIOL & IMMUNOVIROL TUMEURS LAB,F-69372 LYON,FRANCE
[2] HOP ST LOUIS,INSERM,U30L,CENT HEMATOL LAB,F-75475 PARIS 10,FRANCE
[3] ACAD MED SCI USSR,ALL UNION CANC RES CTR,MOSCOW 115478,USSR
[4] HOP SALPETRIERE,SERV NEUROL,F-75651 PARIS 13,FRANCE