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- Correspondence to Dr Ellen J Weber, University of California San Francisco, Emergency Medicine, San Francisco, CA 94143-0208, USA; ellen.weber{at}ucsf.edu
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Publication history
- Accepted April 25, 2019
- First published June 10, 2019.
Online issue publication
June 11, 2019
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© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.