- Correspondence to Dr Janet M Blair, Division of Violence Prevention, National Center for Injury Prevention and Control, Centers for Disease Control and Prevention, 4770 Buford Highway NE, Mailstop F63, Atlanta, GA 30341 USA;
- Received August 31, 2015
- Revised November 6, 2015
- Accepted November 10, 2015
- First published December 30, 2015.
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