- Correspondence to Dr Carol W Runyan, Department of Epidemiology, Colorado School of Public Health, Paediatric Injury Prevention, Education and Research (PIPER) Program, University of Colorado Anschutz Medical Campus, 13001 E. 17th Place, Mail Stop B119, Aurora, CO 80045, USA;
- Received September 23, 2012
- Revised January 2, 2013
- Accepted January 16, 2013
- First published February 23, 2013.
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