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Abstract
Mesh: See more » Communicable Disease ControlEurope/epidemiologyHumansImmunization ProgramsPoliomyelitis/epidemiologyPoliomyelitis/prevention & controlProgram Evaluation
Year: 2002 PMID: 12219168 PMCID: PMC2567593
Source DB: PubMed Journal: Bull World Health Organ ISSN: 0042-9686 Impact factor: 9.408