- Correspondence to David Ederer, Division of Unintentional Injury Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, 4770 Buford Highway NE, MS-62, Atlanta, GA 30341, USA;
- Received September 15, 2014
- Revised June 15, 2015
- Accepted July 30, 2015
- First published August 25, 2015.
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