[1] BETH ISRAEL HOSP,DEPT PATHOL,BOSTON,MA 02215
[2] UNIV LUND,MALMO GEN HOSP,DEPT PEDIAT,S-21401 MALMO,SWEDEN
[3] UNIV LUND,MALMO GEN HOSP,BLOOD COAGULAT LAB,S-21401 MALMO,SWEDEN
[4] UNIV N CAROLINA,DEPT OBSTET & GYNECOL,CHAPEL HILL,NC 27514
[5] HARVARD UNIV,SCH MED,BOSTON,MA 02115
[6] CHARLES A DANA RES INST,BOSTON,MA 02215