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King, C., Beard, J., Crampin, A., Costello, A., Mwansambo, C., Cunliffe, N., Heyderman, R., French, N., Bar-Zeev, N., & Consortium, f. t. V. (2015). methodological challenges in measuring vaccine effectiveness using population cohorts in low resource settings. Vaccine, 33(38), 4748–4755. http://access.bl.uk/ark:/81055/vdc_100026554906.0x000018