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Article Source: Periodontal Disease and Risk of Chronic Obstructive Pulmonary Disease: A Meta-Analysis of Observational Studies
Zeng XT, Tu ML, Liu DY, Zheng D, Zhang J, et al. (2012) Periodontal Disease and Risk of Chronic Obstructive Pulmonary Disease: A Meta-Analysis of Observational Studies. PLOS ONE 7(10): e46508. https://doi.org/10.1371/journal.pone.0046508

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