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Footnotes
1 Snowballing involves asking respondents for an introduction to other potential respondents who fit the relevant criteria and may be willing to take part in the study - with the anticipated result that the original sample will "snowball" into a larger one. This technique is regularly used for hard-to-reach populations.
2 http://www.statistics.gov.uk/about/ethnic_group_statistics/downloads/ethnic_group_statistics.pdf
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