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   <news:title>Indirect Effects in Health Economic Models of Vaccines: Should We Include Them, and How Do We Model Them?</news:title>
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   <news:title>Cost analysis of a nationwide typhoid conjugate vaccine campaign in Burkina Faso</news:title>
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   <news:title>Economic implications of switching to the hexavalent infant vaccine in animmunization program in India</news:title>
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