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D Mangal, Tara and Aylward, R Bruce and Mwanza, Michael and Gasasira, Alex and Abanida, Emmanuel and A Pate, Muhammed and C Grassly, Nicholas (2014) Key issues in the persistence of poliomyelitis in Nigeria: a case-control study. The Lancet Global Health, 2 (2). e90-e97. ISSN 0140-6736