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Staff, Mayo Clinic.
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"Polio Prevention." Mayo Clinic. N.p., 11 Mar. 2014. Web. 10 June 2015.Crosta, Peter.
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W, Atkinson.
"History of Polio (Poliomyelitis)." History of Vaccines. N.p., 31 July 2014. Web. 10 June 2015.
Staff, Mayo Clinic.
"Polio Treatments and Drugs." Mayo Clinic. N.p., 11 Mar. 2014. Web. 10 June 2015.