1 is Medical Education Fellowship Director and Assistant Professor, Department of Emergency Medicine, University of Michigan, Ann Arbor, Michigan, USA.
2 is Professor, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA.
3 is Professor, University of California San Francisco, San Francisco, California, USA; and.
4 is Professor and Associate Dean for Education Research, George Washington University School of Medicine and Health Sciences, Washington, DC, USA.