[1] INST JULES BORDET,DEPT MED,B-1000 BRUSSELS,BELGIUM
[2] BROWN UNIV,ROGER WILLIAMS GEN HOSP,DEPT MED,PROVIDENCE,RI 02908
[3] ST MARYS HOSP,SCH MED,WRIGHT FLEMING INST,LONDON,ENGLAND
[4] HOSP CIVILS STRASBOURG,SERV MALAD SANG,F-67091 STRASBOURG,FRANCE