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Effects of estimated completion time and unconditional gift certificates on questionnaire response

https://doi.org/10.1136/jech-2016-208555

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    Footnotes

    • Twitter Follow Marleen van Gelder at @MarleenvGelder

    • Contributors MMHJvG was the lead author, responsible for study design, data collection, statistical analysis, data interpretation and preparation of the draft manuscript. PMG was responsible for study design, data collection, data interpretation and critically reviewed the manuscript. JHMdV was responsible for study design, data interpretation and critically reviewed the manuscript. NR designed the study, interpreted the results and critically reviewed the manuscript. All authors have read and approved the final manuscript.

    • Funding The PRIDE Study is supported by grants from the Netherlands Organisation for Health Research and Development (ZonMw; grant numbers 36011020 and 836012001).

    • Competing interests None declared.

    • Patient consent Obtained.

    • Ethics approval Regional Committee on Research involving Human Subjects.

    • Provenance and peer review Not commissioned; internally peer reviewed.

    • Data sharing statement Additional information, including sharing of PRIDE Study data, is available on request from the corresponding author (Marleen.vanGelder@radboudumc.nl).