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Hakeberg M, Berggren U, Carlsson SG.Hakeberg M, et al. Among authors: carlsson sg.Community Dent Oral Epidemiol. 1992 Apr;20(2):97-101. doi: 10.1111/j.1600-0528.1992.tb00686.x.Community Dent Oral Epidemiol. 1992.PMID: 1555397
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