[1] Emory Univ, Rollins Sch Publ Hlth, Dept Epidemiol, Atlanta, GA 30322 USA
[2] Emory Univ, Rollins Sch Publ Hlth, Dept Biostat, Atlanta, GA 30322 USA
[3] Vanderbilt Univ, Dept Sociol, 2301 Vanderbilt Pl,201E Garland Hall, Nashville, TN 37235 USA
[4] Emory Univ, Sch Med, Dept Med, Div Cardiol, Atlanta, GA 30322 USA
[5] Drexel Univ, Dornsife Sch Publ Hlth, Dept Epidemiol & Biostat, Philadelphia, PA 19104 USA
[6] Rollins Sch Publ Hlth, Dept Epidemiol, Grace Crum Rollins Bldg,1518 Clifton Rd, Atlanta, GA 30322 USA