1 Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA; Centro de Estudios en Salud, Universidad del Valle de Guatemala, Guatemala City, Guatemala. Electronic address: jmccracken@ces.uvg.edu.gt.
2 Department of Epidemiology, Brown University, Providence, RI, USA.
3 Division of Cardiology, Duke University Medical Center, Durham, NC, USA.
4 Department of Internal Medicine, University of Michigan, Ann Harbor, MI, USA.
5 Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, Bethesda, MD, USA.
6 Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA.
7 Office of Global Health, National Heart, Lung, and Blood Institute, Bethesda, MD, USA.
8 Division of Pulmonary and Critical Care, School of Medicine, Johns Hopkins University, Baltimore, MD, USA.
9 Division of Cardiovascular Medicine, Department of Internal Medicine, College of Medicine, The Ohio State University, Columbus, OH, USA.