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Submitted on: 29 June 2013.
Revised on: 16 September 2013.
Accepted on: 24 October 2013.
___________________CANADIAN MEDICAL ASSOCIATION JOURNAL
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Submitted on: 13 June 1998.
Revised on: 12 July 1998.
Accepted on: 26 August 1998.
___________________CANADIAN MEDICAL ASSOCIATION JOURNAL
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Submitted on: 06 March 2000.
Revised on: 19 May 2000.
Accepted on: 09 July 2000.
___________________CANADIAN MEDICAL ASSOCIATION JOURNAL