- Correspondence to Keshia M Pollack, Department of Health Policy and Management, Johns Hopkins Center for Injury Research and Policy, Johns Hopkins Bloomberg School of Public Health, 624. N Broadway, Room 557, Baltimore, MD 21205, USA;
- Received December 4, 2012
- Revised December 11, 2012
- Accepted December 11, 2012
- First published January 22, 2013.
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