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Use of scratchcards for allocation concealment in a prehospital randomised controlled trial
- Correspondence to Dr Leigh Keen, The Welsh Ambulance Services NHS Trust, Swansea, SA2 0GP, UK; leigh.keen{at}wales.nhs.uk
Citation
Use of scratchcards for allocation concealment in a prehospital randomised controlled trial
Publication history
- Received June 12, 2018
- Revised August 8, 2018
- Accepted August 14, 2018
- First published September 12, 2018.
Online issue publication
November 21, 2018
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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.