1. Department of Emergency Medicine, Brigham and Women’s Hospital, Boston, Massachusetts2Department of Medicine, Harvard Medical School, Boston, Massachusetts
2. medical student at Harvard Medical School, Boston, Massachusetts
3. Department of Emergency Medicine, North Shore Medical Center, Salem, Massachusetts
4. Department of Emergency Medicine, Brigham and Women’s Hospital, Boston, Massachusetts2Department of Medicine, Harvard Medical School, Boston, Massachusetts5Center for Evidence-Based Imaging, Brigham and Women’s Hospital, Boston, Massachusetts
5. resident in emergency medicine at Brigham and Women’s Hospital, Massachusetts General Hospital, and Harvard Medical School, Boston, Massachusetts