- Correspondence to Dr Daren K Heyland, Medicine and Community Health and Epidemiology, Queen's University, Kingston General Hospital, Angada 4, 76 Stuart St, Kingston, ON, Canada K7L 2V7;
- Received July 7, 2015
- Revised September 18, 2015
- Accepted October 13, 2015
- First published November 9, 2015.
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- Data supplement 1 - Online supplement
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