University of Pennsylvania, Philadelphia, Pennsylvania; the Department of Sociology and Center on Health, Risk and Society (Bader), American University, Washington, DC; and the Community Health Program (Iver), The San Francisco Foundation, San Francisco, California Address correspondence to: Karen Glanz, PhD, MPH, Department of Epidemiology and Biostatistics, School of Medicine, University of Pennsylvania, 801 Blockley Hall, 423 Guardian Drive, Philadelphia PA 19104. E-mail: kglanz@upenn.edu. 0749-3797/$36…
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