[1] Vet Affairs Med Ctr, Dept Internal Med, 1030 Jefferson Ave, Memphis, TN 38104 USA
[2] Univ Tennessee, Dept Internal Med, Hlth Sci Ctr, Memphis, TN 38163 USA
[3] Univ Tennessee, Coll Med, Hlth Sci Ctr, Memphis, TN 38163 USA
[4] Univ Tennessee, Dept Med, Div Pulm Crit Care & Sleep Med, Hlth Sci Ctr, Memphis, TN 38163 USA
[5] Univ Tennessee, Dept Pharm, Hlth Sci Ctr, Memphis, TN 38163 USA
[6] Univ Tennessee, Dept Med, Div Cardiovasc Dis, Hlth Sci Ctr, Memphis, TN 38163 USA