Efficacy of influenza vaccine in the elderly.
Schwartz
K
K
D000368:Aged; D004311:Double-Blind Method; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000517:prevention & control*; D009426:Netherlands; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results; D012107:Research Design
D007252:Influenza Vaccines