The costs, effects and cost-effectiveness of strategies to increase coverage of routine immunizations in low- and middle-income countries: systematic review of the grey literature.
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Batt, Katherine, Fox-Rushby, J. A. & Castillo-Riquelme, Marianela. (2004). The costs, effects and cost-effectiveness of strategies to increase coverage of routine immunizations in low- and middle-income countries: systematic review of the grey literature.. Bulletin of the World Health Organization, 82 (9), 689 - 696. World Health Organization. https://iris.who.int/handle/10665/269234