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2. National, state, and local area vaccination coverage among children aged 19-35 months United States, 2011.;MMWR Morb Mortal Wkly Rep,2012
3. Antivaccination activists on the world wide web.;Davies;Archives of Disease in Childhood,2002
4. Immunizations for high-risk populations.;Shepherd;Journal of American Pharmacy Association,2001
5. Parental vaccine refusal.;Smith;Contemporary Pediatrics,2010