[1] Univ Tennessee, Ctr Hlth Sci, Coll Med, Dept Med, Memphis, TN 38163 USA
[2] Johns Hopkins Univ Hosp, Dept Med, Osler Internal Med Residency Program, 5 N Ann St, Baltimore, MD 21231 USA
[3] Univ Tennessee, Dept Med & Med Educ, Coll Med Chattanooga, Chattanooga, TN USA
[4] Univ Tennessee, Ctr Hlth Sci, Coll Med, Memphis, TN 38163 USA
[5] Virginia Commonwealth Univ, Div Hosp Med, Dept Internal Med, Sch Med, Richmond, VA USA