- Correspondence to Dr Robert J Marshall, Cornwall Health Campus, Knowledge Spa, Royal Cornwall Hospital, Treliske, Truro, Cornwall TR1 3HD, UK;
- Received 27 October 2012
- Revised 16 January 2013
- Accepted 28 January 2013
- Published in print 1 February 2013.
- Published online 28 February 2013.
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