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beta-Lactamase producing bacteria in adult periodontitis.
van Winkelhoff AJ, Winkel EG, Barendregt D, Dellemijn-Kippuw N, Stijne A, van der Velden U. van Winkelhoff AJ, et al. Among authors: winkel eg. J Clin Periodontol. 1997 Aug;24(8):538-43. doi: 10.1111/j.1600-051x.1997.tb00226.x. J Clin Periodontol. 1997. PMID: 9266340
Smoking affects the subgingival microflora in periodontitis.
van Winkelhoff AJ, Bosch-Tijhof CJ, Winkel EG, van der Reijden WA. van Winkelhoff AJ, et al. Among authors: winkel eg. J Periodontol. 2001 May;72(5):666-71. doi: 10.1902/jop.2001.72.5.666. J Periodontol. 2001. PMID: 11394403
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