1. International Conference on Harmonization. The medical dictionary for regulatory activities. Available on the world wide web: http://www.ich.org/cache/compo/276-254-1.html and http://meddramsso.com/NewWeb2003/index.htm.
2. The Uppsala Monitoring Centre. WHO collaborating centre for international drug monitoring: adverse reaction terminology (WHO-ART). Available on the world wide web: http://www.who-umc.org/DynPage.aspx.
3. Vaccine Adverse Event Reporting System. Coding symbols for a thesaurus of adverse reaction terms (COSTART). Available on the world wide web: http://vaers.hhs.gov (last accessed March 30, 2006).
4. Council for International Organizations of Medical. Available on the world wide web: http://www.cioms.ch (last accessed March 30, 2006).
5. World Health Organization. Surveillance of adverse events following immunization. Field guide for managers of immunization programmes. Global Progamme for Vaccines and Immunization. Expanded Programme on Immunization. World Health Organization, Geneva, 1997. Report available on the world wide web at: http://www.who.int/vaccines-documents/DocsPDF/www9541.pdf.