1. Department of Medicine, University of Florida College of Medicine, Gainesville, Florida, USA
2. Florida Atlantic University Charles E. Schmidt College of Medicine, Boca Raton, Florida, USA
3. Department of Family Medicine, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
4. University of Colorado School of Medicine, Anschutz, Colorado, USA
5. George Washington University School of Medicine, Washington, DC, USA