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Evaluation of the effects of an offer of a monetary incentive on the rate of questionnaire return during follow-up of a clinical trial: a randomised study within a trial
Hardy, Pollyanna, Bell, Jennifer L., Brocklehurst, PeterVolume:
16
Language:
english
Journal:
BMC Medical Research Methodology
DOI:
10.1186/s12874-016-0180-9
Date:
December, 2016
File:
PDF, 723 KB
english, 2016