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The study was supported by grants from the Medical Research Council [G0701757]; and the Wellcome Trust [084840]; with contributions from the Economic and Social Research Council and Department of Health.

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Minority groups are represented in small numbers, even in large surveys and it is difficult and costly to ‘boost’ the sample sizes of such groups using probability-sampling methods.

The majority of WPSs rely on quota sampling from volunteer web-panels run by market research companies.