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2. Progress in development of new attenuated strains of Salmonella typhi as live oral vaccines against typhoid fever;Levine,1997
3. The case for routine childhood vaccination against hepatitis A;Koff;N Engl J Med,1999
4. Economic analysis of vaccines and vaccination programmes:evaluating the economic rationale for immunization;Levine,1997
5. Meeting on vaccine development and delivery; partnership for the 21st century,1999