- Correspondence to M E Faughnan, St. Michael's Hospital, University of Toronto, St. Michael's Hospital, 30 Bond St, Toronto, M5B-1W8, Canada;
- Received 2 May 2009
- Revised 22 May 2009
- Accepted 30 May 2009
- Published in print 1 January 2011.
- Published online 14 January 2011.
- Published first 23 June 2009.
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