Laura A Dean1, Emily L Aaronson2, Kathleen Wittels3, Susan R Wilcox2. 1. 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. 2. Department of Emergency Medicine, Harvard Medical School, 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.