- Correspondence to Dr Om P Kurmi, Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Richard Doll Building, Old Road Campus, Roosevelt Drive, Oxford, OX3 7LF, UK;
- Received March 5, 2014
- Revised July 9, 2014
- Accepted July 18, 2014
- First published July 31, 2014.
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