Pneumococcal Vaccines For Preventing Pneumonia In Chronic Obstructive Pulmonary Disease
COCHRANE DATABASE OF SYSTEMATIC REVIEWS（2017）
Key words
Pneumococcal Infections [mortality,prevention & control],Pneumococcal Vaccines [administration & dosage],Pulmonary Disease, Chronic Obstructive [complications,mortality],Randomized Controlled Trials as Topic,Humans,Middle Aged
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