[1] BETH ISRAEL HOSP,DEPT MED,HARVARD THORNDIKE LAB,BOSTON,MA 02215
[2] HARVARD UNIV,SCH MED,BOSTON,MA 02115
[3] STATE UNIV LEIDEN HOSP,HAEMOSTASIS & THROMBOSIS RES UNIT,2333 AA LEIDEN,NETHERLANDS
[4] HOTEL DIEU,CENT HEMATOL LAB,F-75181 PARIS 04,FRANCE
[5] MIT,DEPT BIOL,CAMBRIDGE,MA 02139
[6] MIT,WHITAKER COLL,CAMBRIDGE,MA 02139