- Correspondence to David Swedler, Center for Injury Research and Policy, Hampton House Room 554, 624 N. Broadway, Baltimore, Maryland 21205, USA
- Received 27 February 2013
- Revised 19 April 2013
- Accepted 29 April 2013
- Published in print 1 February 2014.
- Published online 17 January 2014.
- Published first 31 May 2013.
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