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County-level trends in vaccination coverage among children aged 19-35 months - United States, 1995-2008 |
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| Authors: | Smith Philip J,Singleton James A National Center for Immunization Respiratory Diseases Centers for Disease Control Prevention |
| Affiliation: | National Center for Immunization and Respiratory Diseases, Atlanta, GA 30333, USA. pzs6@cdc.gov |
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| 本文献已被 PubMed 等数据库收录！ | |