1. Department of Medicine , Boston University School of Medicine , 72 East Concord Street , Boston, MA 02118 , USA
2. Prideaux Centre for Research in Health Professions Education , Flinders University , Flinders , Australia
3. Department of Medical Education , University of Michigan , Ann Arbor, MI , USA
4. Department of Medicine , Uniformed Services University of the Health Sciences , Bethesda, MD , USA