Methodology of observational studies of pneumococcal polysaccharide vaccine.
D000367:Age Factors; D000368:Aged; D002986:Clinical Trials as Topic / Q000379:methods / Q000592:standards*; D017714:Community-Acquired Infections / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control; D006760:Hospitalization; D006801:Humans; D022242:Pneumococcal Vaccines / Q000008:administration & dosage* / Q000592:standards; D011018:Pneumonia, Pneumococcal / Q000209:etiology / Q000517:prevention & control*; D015203:Reproducibility of Results; D012307:Risk Factors; D013997:Time Factors; D014611:Vaccination
D022242:Pneumococcal Vaccines