1. Department of Medicine Education, Southern Illinois University School of Medicine, Springfield, Illinois, USA
2. J. Roland Folse Professor of Surgical Education, Southern Illinois University School of Medicine, Springfield, Illinois, USA
3. Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, Illinois, USA
4. Department of Emergency Medicine, Southern Illinois University School of Medicine, Springfield, Illinois, USA
5. Department of Family and Community Medicine, Quincy, Illinois, USA