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Effect of Inactivated Poliovirus Vaccine Campaigns, Pakistan, 2014-2017.
Grassly NC, Wadood MZ, Safdar RM, Mahamud AS, Sutter RW.
Emerg Infect Dis. 2018 Nov 17;24(11). doi: 10.3201/eid2411.180050.
https://wwwnc.cdc.gov/eid/article/24/11/18-0050-techapp1.pdf