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PDFMethodologic issues
Different approaches to obtaining consent for follow-up result in biased samples
- Correspondence to Dr I Barry Pless, Montreal Children's Hospital, 2300 Tupper St, C538, Montreal, Quebec H3H 1P3, Canada; barry.pless{at}mcgill.ca
Citation
Different approaches to obtaining consent for follow-up result in biased samples
Publication history
- Accepted February 21, 2011
- First published March 24, 2011.
Online issue publication
May 13, 2016
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© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.