- Correspondence to Dr Christian Vaillancourt, Clinical Epidemiology Unit, The Ottawa Hospital, Civic Campus, F658, 1053 Carling Ave., Ottawa, Ontario, Canada K1Y 4E9;
- Received November 22, 2012
- Revised April 2, 2013
- Accepted April 3, 2013
- First published May 1, 2013.
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