http://www.rho.org/files/rb3/AEFI_Causality_Assessment_WHO_2005.pdf
https://brightoncollaboration.org/public/who-we-are/our-story.html
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WHO Aide-Mémoire on AEFI causality assessment - http://www.who.int/vaccines-documents/DocsPDF05/815.pdf
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The WHO Has removed the Brighton Classification from it's web site it appears.
The classification is available still at
http://www.rho.org/files/rb3/AEFI_Causality_Assessment_WHO_2005.pdf
In case this page is removed it is available on this website