1. Northwestern Memorial Hospital, Chicago, IL, USA
2. Department of Emergency Medicine, University of Washington, Seattle, WA, USA
3. Division of General Internal Medicine and Geriatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
4. Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
5. Emergency Medicine, University of Michigan Medical School, Ann Arbor, MI, USA
6. School of Public Health & Community Medicine, University of New South Wales, Sydney, NSW, Australia
7. Dr. John Sherman Appleman Professor of Medicine and Medical Education, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
8. Feinberg School of Medicine, Departments of Medicine and Medical Education, Northwestern University, Chicago, IL, USA