[1] Johns Hopkins Univ, Sch Med, Div Cardiol, Baltimore, MD USA
[2] Welch Ctr Clin Res & Prevent, Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[3] Bridgeport Hosp, Bridgeport, CT USA
[4] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[5] Johns Hopkins Univ, Sch Med, Dept Med, Div Pulm & Crit Care, Baltimore, MD USA
[6] Univ N Carolina, Gillings Sch Publ Hlth, Dept Epidemiol, Chapel Hill, NC USA
[7] SUNY Stony Brook, Program Publ Hlth, Stony Brook, NY USA
[8] Johns Hopkins Sch Med, Blalock Room 524D2,600 North Wolfe St, Baltimore, MD 21287 USA