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Chicago-tyylinen lähdeviittausDonà, Maria Gabriella, et al. Anal Cytological Abnormalities and Epidemiological Correlates Among Men Who Have Sex With Men At Risk for HIV-1 Infection. BioMed Central, 2012.
MLA-viiteDonà, Maria Gabriella, et al. Anal Cytological Abnormalities and Epidemiological Correlates Among Men Who Have Sex With Men At Risk for HIV-1 Infection. BioMed Central, 2012.
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