- Correspondence to Dr Mark Sheehan, The Ethox Centre, Nuffield Department of Population Health, University of Oxford, Old Road Campus, Rosemary Rue Building Headington, Oxford OX3 7LG, UK;
- Received December 12, 2012
- Revised July 24, 2013
- Accepted July 28, 2013
- First published September 17, 2013.
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