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Effect of the introduction of pneumococcal conjugate vaccination on invasive pneumococcal disease in The Gambia: a population-based surveillance study

Service delivery Gambia Pneumococcal disease English PCV New vaccine introduction African Region

Placebo use in vaccine trials: Recommendations of a WHO expert panel

Vaccines & delivery devices English World Health Organisation (WHO)

Case-control vaccine effectiveness studies: Preparation, design, and enrollment of cases and controls

Vaccines & delivery devices English Policy and legislation Performance monitoring

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