- Correspondence to Dr Cassandra Crifasi, Department of Health Policy and Management, Center for Gun Policy and Research, Johns Hopkins Bloomberg School of Public Health, 624 N Broadway, Rm 588, Baltimore, MD 21205, USA;
- Received August 25, 2015
- Revised November 17, 2015
- Accepted November 28, 2015
- First published December 30, 2015.
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