[1] Emory Univ, Rollins Sch Publ Hlth, Dept Epidemiol, Atlanta, GA 30322 USA
[2] Emory Univ, Sch Med, Div Pulm Allergy & Crit Care Med, Atlanta, GA 30322 USA
[3] Univ Kansas, Sch Med, Div Cardiol, Wichita, KS 67214 USA
[4] Robert J Dole Vet Affairs Med Ctr, Wichita, KS USA
[5] Emory Univ, Sch Med, Div Cardiol, Atlanta, GA 30322 USA