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Intervene before leaving: clustered lot quality assurance sampling to monitor vaccination coverage at health district level before the end of a yellow fever and measles vaccination campaign in Sierra Leone in 2009

Lorenzo Pezzoli*, Ishata Conteh, Wogba Kamara, Marta Gacic-Dobo, Olivier Ronveaux, William A Perea and Rosamund F Lewis

BMC Public Health 2012, 12:415  doi:10.1186/1471-2458-12-415

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