1 Department of Emergency Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Emergency Medicine, Harvard Medical School, Boston, MA, USA; Partners In Health, Boston, MA, USA. Electronic address: rmarsh@bwh.harvard.edu.
2 Department of Emergency Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA; Department of Emergency Medicine, Harvard Medical School, Boston, MA, USA; Partners In Health, Boston, MA, USA.