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Cummings KM, Hyland A, Saunders-Martin T, Perla J, Coppola PR, Pechacek TF.Cummings KM, et al. Among authors: hyland a.Am J Public Health. 1998 Jun;88(6):932-6. doi: 10.2105/ajph.88.6.932.Am J Public Health. 1998.PMID: 9618623Free PMC article.Clinical Trial.
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