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Correspondence: Jay M. Bernhardt, Behavioral Sciences and Health Education, Rollins School of Public Health, Emory University, 1518 Clifton Rd NE, #560, Atlanta, GA 30322, USA; fax: 404-727-1369; email: jbernha@sph.emory.edu
This study was supported by the Center for Public Health Communication at the Rollins School of Public Health of Emory University.
© 2005 CDC.