1 Science in the Public Sphere, RTI International, Research Triangle Park, North Carolina; Duke Forge, School of Medicine, Duke University, Durham, North Carolina; Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina. Electronic address: bsouthwell@rti.org.
2 Department of Communication, Cornell University, Ithaca, New York.
3 Annenberg School for Communication, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Maryland.