References

Levine, M., Can needle-free administration of vaccines become the norm in global immunization? Nature Medicine. 10, 99-103 (2003)

Lloyd, J., Technologies for vaccine delivery in the 21st century (WHO/V&B/00.35) December 2000. http://www.who.int/vaccines-documents/DocsPDF00/www554.pdf (accessed 6 Jan 2004)

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