[1] CHILDRENS HOSP MED CTR,DIV HEMATOL & ONCOL,BOSTON,MA 02115
[2] BOSTON CITY HOSP,SIDNEY FARBER CANC CTR,DEPT OBSTET,DIV LYING IN,BOSTON,MA 02118
[3] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[4] HARVARD UNIV,SCH MED,DEPT OBSTET & GYNECOL,BOSTON,MA 02115
[5] YALE NEW HAVEN HOSP,YALE MED SCH,DEPT PEDIAT,NEW HAVEN,CT
[6] YALE NEW HAVEN HOSP,YALE MED SCH,DEPT OBSTET,NEW HAVEN,CT
[7] UNIV COLL HOSP LONDON,SCH MED,DEPT PEDIAT,LONDON WC1E 6JJ,ENGLAND
[8] UNIV COLL HOSP LONDON,SCH MED,DEPT OBSTET,LONDON WC1E 6JJ,ENGLAND