机构:
Boston Univ, Sch Med, Div Cardiac Surg, 80 E Concord St, Boston, MA 02118 USABoston Univ, Sch Med, Div Cardiac Surg, 80 E Concord St, Boston, MA 02118 USA
机构:
Univ London St Georges Hosp, Sch Med, Dept Obstet & Gynecol, London, EnglandUniv London St Georges Hosp, Sch Med, Dept Obstet & Gynecol, London, England