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Centers for Disease Control and Prevention web site.
CDC Media Relations, News Release.
CDC, Morbidity and Mortality Weekly Report, Aug. 29, 2008.
CDC, Morbidity and Mortality Weekly Report, May 16, 2008.
CDC, Morbidity and Mortality Weekly Report, Jan. 25, 2008.
FDA web site.
Reviewed by Sabrina Felson, MD on February 12, 2018
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