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http://www.who.int/immunization/diseases/hpv/en/
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http://www.euro.who.int/en/health-topics/noncommunicable-diseases/cancer/news/news/2016/03/building-the-case-and-capacities-for-successful-hpv-vaccine-introduction
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5. CDC website. Frequently asked questions about HPV vaccine safety.
https://www.cdc.gov/vaccinesafety/vaccines/hpv/hpv-safety-faqs.html
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