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Song, Joon Young, et al. "Effectiveness of Influenza and Pneumococcal Polysaccharide Vaccines against Influenza-related Outcomes Including Pneumonia and Acute Exacerbation of Cardiopulmonary Diseases: Analysis By Dominant Viral Subtype and Vaccine Matching." PLoS One 2018.

Song, Joon Young, et al. "Effectiveness of Influenza and Pneumococcal Polysaccharide Vaccines against Influenza-related Outcomes Including Pneumonia and Acute Exacerbation of Cardiopulmonary Diseases: Analysis By Dominant Viral Subtype and Vaccine Matching." PLoS One 2018.