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Ellen McCarthy, The Washington Post
Aug 28, 2003
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Aug 27, 2003Tom Spooner
Apr 16, 2003Lee Rainie
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of cell phone users have software applications or "apps" on their phones that help them track or manage their health.
Copyright 2012
The Pew Research Center's Internet & American Life Project is one of seven projects that make up the Pew Research Center. The Center is supported by The Pew Charitable Trust.