- Correspondence to Dr Melissa C Mercado, Division of Unintentional Injury Prevention, National Center for Injury Prevention and Control, CDC, 4770 Buford Hwy NE, MS F-62, Atlanta, GA 30341-3717, USA;
- Received May 6, 2015
- Revised September 30, 2015
- Accepted December 3, 2015
- First published January 12, 2016.
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