- Correspondence to Dr D Alex Quistberg, Harborview Injury Prevention & Research Center, 325 Ninth Ave, Box 359660, Seattle, WA 98104–2499, USA;
- Received 13 September 2013
- Revised 22 November 2013
- Accepted 4 December 2013
- Published in print 1 April 2015.
- Published online 24 March 2015.
- Published first 19 December 2013.
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