Article info
Letters
Effects of estimated completion time and unconditional gift certificates on questionnaire response
- Correspondence to Dr Marleen MHJ van Gelder, Department for Health Evidence (HP 133), Radboud University Medical Center, P.O. Box 9101, Nijmegen 6500 HB, The Netherlands; Marleen.vanGelder{at}radboudumc.nl
Citation
Effects of estimated completion time and unconditional gift certificates on questionnaire response
Publication history
- Received October 21, 2016
- Accepted October 26, 2016
- First published November 11, 2016.
Online issue publication
April 10, 2017
Article Versions
- Previous version (11 November 2016).
- You are viewing the most recent version of this article.
Request permissions
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
Copyright information
Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/