1. Measles cases and outbreaks. Available at: http://www.cdc.gov/measles/cases-outbreaks.html. Accessed June 2, 2015.
2. Vaccine hesitancy: definition, scope and determinants;MacDonald;Vaccine,2015
3. National, state, and selected local area vaccination coverage among children aged 19-35 months - United States, 2013;Elam-Evans;MMWR Morb Mortal Wkly Rep,2014
4. Children who have received no vaccines: who are they and where do they live?;Smith;Pediatrics,2004
5. Severe pediatric influenza in California, 2003-2005: implications for immunization recommendations;Louie;Pediatrics,2006