WHO (World Health Organization). 2003. Making choices in health: WHO guide to cost-effectiveness analysis. Edited by T. Tan-Torres Edejer, R. Baltussen, T. Adam, R. Hutubessy, A. Acharya, D. B. Evans, and C. J. L. Murray. Geneva: World Health Organization.
WHO. 2004. Global burden of disease 2004 update: Disability weights for diseases and conditions. Geneva: World Health Organization.
WHO. 2006. Global immunization vision and strategy. www.who.int/immunization/givs/en/index.html.
WHO. 2010. The Initiative for Vaccine Research, strategic plan 2010-2020. Geneva: Initiative for Vaccine Research, Department of Immunization, Vaccines and Biologicals.