- Correspondence to Dr Sarah Derrett, Injury Prevention Research Unit, Department of Preventive and Social Medicine, Dunedin School of Medicine, University of Otago, PO Box 56, Dunedin 9054, New Zealand;
- Received November 6, 2012
- Revised January 23, 2013
- Accepted February 13, 2013
- First published March 16, 2013.
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