- Correspondence to Dr Brent E Hagel, Departments of Paediatrics and Community Health Sciences, University of Calgary, Alberta Children's Hospital, 2888 Shaganappi Trail NW, Calgary, AB, Canada T3B 6A8;
- Received May 31, 2012
- Revised December 17, 2012
- Accepted January 2, 2013
- First published January 30, 2013.
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