@Article{HalloranStruchinerLongini1997,
  author =          {Halloran, ME and Struchiner, CJ and Longini, IM},
  title =          {Study designs for evaluating different efficacy
                and effectiveness aspects of vaccines.},
  journal =          {American Journal of Epidemiology},
  year =          {1997},
  volume =          {146},
  pages =          {789-803}
}

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