1. Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
2. Central Michigan University College of Medicine, Mount Pleasant, MI, USA
3. Department of Emergency Medicine, Northwestern University, Evanston, IL, USA
4. Section of Emergency Medicine, Department of Medicine, University of Chicago, Chicago, IL, USA
5. Department of Emergency Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA
6. Department of Emergency Medicine, University of Florida College of Medicine, Gainesville, FL, USA
7. Emory University School of Medicine, Atlanta, GA, USA
8. Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA