- Correspondence to David M Shaw, Faculty of Medicine Dental School, University of Glasgow, 378 Sauchiehall Street, Glasgow G2 3JZ, UK;
- Received 17 December 2008
- Revised 4 May 2009
- Accepted 5 June 2009
- Published in print 1 September 2009.
- Published online 28 August 2009.
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