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Reduction in hospital admissions for pneumonia in non-institutionalised elderly people as a result of influenza vaccination: a case-control study in Spain.
Puig-Barberà J, Márquez-Calderón S, Masoliver-Fores A, Lloria-Paes F, Ortega-Dicha A, Gil-Martín M, Calero-Martínez MJ. Puig-Barberà J, et al. Among authors: calero martinez mj. J Epidemiol Community Health. 1997 Oct;51(5):526-30. doi: 10.1136/jech.51.5.526. J Epidemiol Community Health. 1997. PMID: 9425463 Free PMC article.