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“Tectonic shift.” That is how the architects of the first Health Information National Trends Survey characterized recent changes in the way we seek and consume health information (Hesse et al., 2005). Thanks to the dramatic diffusion of the Internet and widespread availability of health information and services online, the majority of Americans now conduct increasing amounts of their health communication via online channels. An overview of e-health (Health websites. Health devices. Bundled interventions). Technological features (Interactivity. Tailoring). Use patterns of online health (Information seeking. P2P communication. Patient-physician dialogue). Conceptual challenges and theoretical opportunities (Sources, sourcing and source-layering. Agency and customization. Credibility). Conclusion. References. Tables (Advantages and disadvantages of eHealth. Facilitators of and barriers to eHealth). Figure (Online health source typology).
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