[1] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[2] Harvard Univ, Harvard Med Sch, Boston, MA 02115 USA
[3] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Boston, MA USA
[4] Brigham & Womens Hosp, Div Global Obstet & Gynecol, 75 Francis St, Boston, MA 02115 USA