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Clinical effectiveness of 23-valent pneumococcal polysaccharide vaccine against pneumonia in middle-aged and older adults: A matched case–control study

VaccinationVaccine SafetyVaccinologyClinical EffectivenessCase–control StudyRespiratory InfectionInfectious Respiratory DiseaseVaccine EfficacyInfection ControlOlder AdultsMedicineEpidemiology