1 Department of Emergency Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA; Harvard Medical School, 25 Shattuck St., Boston, MA, USA; The Warren Alpert Medical School of Brown University, 222 Richmond St, Providence, RI, USA.
2 Department of Emergency Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA.
3 Department of Emergency Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA; Harvard Medical School, 25 Shattuck St., Boston, MA, USA.
4 Harvard Medical School, 25 Shattuck St., Boston, MA, USA; Healthcare Systems Engineering, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA.
5 Harvard Medical School, 25 Shattuck St., Boston, MA, USA; Department of Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA; Lawrence Center for Quality and Safety, Massachusetts General Hospital, Boston, MA, USA.
6 Harvard Medical School, 25 Shattuck St., Boston, MA, USA; Department of Medicine, Brigham and Women's Hospital, 75 Francis St., Boston, MA, USA.
7 Harvard Medical School, 25 Shattuck St., Boston, MA, USA; Division of Pulmonary and Critical Care, Department of Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA.
8 Department of Emergency Medicine, Massachusetts General Hospital, 55 Fruit St., Boston, MA, USA; Harvard Medical School, 25 Shattuck St., Boston, MA, USA. Electronic address: jonathan.sonis@mgh.harvard.edu.