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a) The ethnic background of the population of London in 2007 as predicted by Census data from 2001. [“London: Resident population estimates by ethnic group”. Office for National Statistics Neighbourhood Statistics] b) The ethnic background of all patients presenting with optic neuritis from March 2009 until July 2010. The ethnicity profiles of the two groups appear very similar. c=white Caucasian, af=African or African Caribbean, as=Asian, o=Other.
