1 Division of Emergency Critical Care Medicine, Department of Emergency Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts.
2 Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts; Department of Emergency Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Department of Emergency Medicine, Massachusetts General Hospital, Boston, Massachusetts.
3 Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts; Department of Emergency Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
4 Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, Massachusetts; Department of Obstetrics and Gynecology, Harvard Medical School, Boston, Massachusetts.
5 Department of Emergency Medicine, Harvard Medical School, Boston, Massachusetts; Department of Emergency Medicine, Massachusetts General Hospital, Boston, Massachusetts.