TY - JOUR T1 - 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 JO - BMC Medical Research Methodology UR - http://eprints.whiterose.ac.uk/131113/ PY - 2016/07/15 AU - Hardy P AU - Bell JL AU - Brocklehurst P ED - DO - DOI: 10.1186/s12874-016-0180-9 VL - 16 IS - 1 Y2 - 2024/12/22 ER -