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Helleringer, Stephane; Frimpong, Jemima A; Abdelwahab, Jalaa; Asuming, Patrick; Touré, Hamadassalia; Awoonor-Williams, John Koku; Abachie, Thomas; Guidetti, Flavia Supplementary polio immunization activities and prior use of routine immunization services in non-polio-endemic sub-Saharan Africa. Bulletin of the World Health Organization, 2012, vol.90, n. 7, ISSN 0042-9686.

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