Gary G. Bennett, K. Viswanath, and Karen M. Emmons are with the Department of Society, Human Development and Health, Harvard School of Public Health, Boston, and the Center for Community-Based Research, Dana-Farber Cancer Institute, Boston, Mass. Kathleen Y. Wolin is with the Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Ill. Sandy Askew is with the Center for Community-Based Research, Dana-Farber Cancer Institute, Boston. Elaine Puleo is with the...