1WHO. State of the world's vaccines and immunization. 2002.
2WHO. WHOvaccine-preventable diseases: monitoring system. 2003 global summary. Available at http://www.who. int/vaccines-documents/GlobalSummary/GlobalSummary. pdf
3WHO. Core information for the development of immunization policy. 2002update. Geneva, World Health Organisation, March 2003.
4Global progress towards universal childhood hepatitis B vaccination,2003, Wkly Epidemiol Rec,2003,78(42) :366-370.
5Global Alliance for Vaccines and Immunization. GAVI Milestones, 2003.Available at http://www. vaccinelliance.org/home/General-Information/About-alliance/Background/milestones. php
