[1] Harvard Sch Publ Hlth, Dept Environm Hlth, Boston, MA 02115 USA
[2] Univ Valle Guatemala, Ctr Estudios Salud, Guatemala City, Guatemala
[3] Brown Univ, Dept Epidemiol, Providence, RI 02912 USA
[4] Duke Univ, Ctr Med, Div Cardiol, Durham, NC USA
[5] Univ Michigan, Dept Internal Med, Ann Arbor, MI 48109 USA
[6] NHLBI, Div Cardiovasc Sci, Bethesda, MD 20892 USA
[7] NHLBI, Off Global Hlth, Bethesda, MD 20892 USA
[8] Johns Hopkins Univ, Sch Med, Div Pulm & Crit Care, Baltimore, MD USA
[9] Ohio State Univ, Coll Med, Dept Internal Med, Div Cardiovasc Med, Columbus, OH 43210 USA