- Correspondence to Dr Ian Colman, Department of Epidemiology and Community Medicine, University of Ottawa, 451 Smyth Road, Room 3230C, Ottawa, Ontario K1H 8M5, Canada;
- Received April 1, 2015
- Revised August 5, 2015
- Accepted August 6, 2015
- First published August 26, 2015.
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