- Correspondence to Dr Paul Sullivan, CLAHRC for Northwest London, Imperial College, Chelsea and Westminster Hospital Campus, 369 Fulham Road, London SW10 9NH, UK;
- Received 24 August 2012
- Revised 20 January 2013
- Accepted 4 March 2013
- Published in print 18 May 2013.
- Published online 21 May 2013.
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