Marc R. Larochelle and Jeffrey H. Samet are with the Boston University School of Medicine, Boston, MA. Svetla Slavova is with the Department of Biostatistics, University of Kentucky, Lexington. Patrick J. Ward is with the Department of Epidemiology, University of Kentucky, Lexington. Elisabeth D. Root is with the Department of Geography, Ohio State University, Columbus. Daniel J. Feaster is with the Department of Public Health Sciences, University of Miami Miller School of Medicine, Miami, FL. Sabrina C....