- Correspondence to Dr Michelle Lin, Department of Emergency Medicine, San Francisco General Hospital, 1001 Potrero Avenue, Suite 1E21, San Francisco, CA 94110, USA;
- Received December 30, 2014
- Revised May 26, 2015
- Accepted July 23, 2015
- First published August 14, 2015.
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- Data supplement 1 - Online supplement
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