[1] DIAGNOST ULTRASOUND ASSOCIATES,BOSTON,MA
[2] BRIGHAM & WOMENS HOSP,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,BOSTON,MA 02115
[3] HARVARD UNIV,SCH MED,DEPT PEDIAT,BOSTON,MA 02115
[4] CHILDRENS HOSP MED CTR,DEPT MED,BOSTON,MA 02115
[5] BETH ISRAEL HOSP,DEPT PEDIAT,BOSTON,MA 02215