[1] Univ South Carolina, Dept Epidemiol & Biostat, Arnold Sch Publ Hlth, Columbia, SC 29208 USA
[2] Univ South Carolina, South Carolina SmartState Ctr Healthcare Qual, Arnold Sch Publ Hlth, Columbia, SC 29208 USA
[3] Univ South Carolina, Rural & Minor Hlth Res Ctr, Arnold Sch Publ Hlth, Columbia, SC 29208 USA
[4] Univ South Carolina, Off Study Aging, Arnold Sch Publ Hlth, Columbia, SC 29208 USA
[5] Univ South Carolina, Sch Med, Dept Internal Med, Columbia, SC 29208 USA