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A randomised trial and economic evaluation of the effect of response mode on response rate, response bias, and item non-response in a survey of doctors

Anthony Scott, Sung-Hee Jeon, Catherine M Joyce*, John S Humphreys, Guyonne Kalb, Julia Witt and Anne Leahy

BMC Medical Research Methodology 2011, 11:126  doi:10.1186/1471-2288-11-126

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