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Surveillance systems to track progress toward global polio eradication - worldwide, 2012-2013.
Levitt A, Diop OM, Tangermann RH, Paladin F, Kamgang JB, Burns CC, Chenoweth PJ, Goel A, Wassilak SG; Centers for Disease Control and Prevention (CDC).
MMWR Morb Mortal Wkly Rep
https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6316a5.htm