| http://www.w3.org/ns/prov#value | - Recent public opinion polls (taken between 1994 and 1995) have for example revealed that about 55 to 75 million Americans consider bad breath a principle concern in social encounters (J. L. Richter: Diagnosis and Treatment of Halitosis; Compendium 17 (1996); p. 370-386, and references quoted therein).
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