1. Center for Health Professions Education, Uniformed Services University , Bethesda, MD 20814, USA
2. OnlineMedEd , Austin, TX 78758, USA
3. The Henry M. Jackson Foundation for the Advancement of Military Medicine , Bethesda, MD 20817, USA
4. Department of Military and Emergency Medicine, Uniformed Services University , Bethesda, MD 20814, USA