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Sampling 'hard-to-reach' populations in health research: yield from a study targeting Americans living in Canada

Danielle A Southern email, Steven Lewis email, Colleen J Maxwell email, James R Dunn email, Tom W Noseworthy email, Gail Corbett email, Karen Thomas email and William A Ghali email

BMC Medical Research Methodology 2008, 8:57doi:10.1186/1471-2288-8-57

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