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Centers for Disease Control and Prevention. Morbidity and Mortality Weekly Report (MMWR). http://www.cdc.gov/mmwr/preview/mmwrhtml/mm5941a3.htm. October 22, 2010. Accessed December 31, 2011.
Centers for Disease Control and Prevention. Blood safety. http://www.cdc.gov/bloodsafety/. Updated August 11, 2011. Accessed February 2016.