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Most health information apps available now enable patients to do little more than view their EHR data, but some do more, including those based on Blue Button 2.0 that give patients access to claims and insurance data, and enable patients to make health care appointments and organize their medical information. Only a small proportion of patients use providers' portals, data aggregator apps like Microsoft's now-defunct HealthVault have not caught on with the public, and privacy of data in third-party apps is an issue.

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