The effects of lottery incentive and length of questionnaire on health survey response rates: a randomized study. (Q52894909)

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scientific article published in November 1999
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The effects of lottery incentive and length of questionnaire on health survey response rates: a randomized study.
scientific article published in November 1999

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    The effects of lottery incentive and length of questionnaire on health survey response rates: a randomized study. (English)

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