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By Zimmerman Downs Joyce M.   Shuman Deanne   Stull Sharon C.   Ratzlaff Robert E.   in Journal of Dental Hygiene

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American Dental Hygienists' Association‎(2010)‎

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By Downs Joyce M   Shuman Deanne   Stull Sharon S   Ratzlaff Robert E   in Journal of Dental Hygiene

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American Dental Hygienists' Association‎(2007)‎

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