- Correspondence to Dr Ailsa Lyons, Division of Epidemiology and Public Health, The University of Nottingham, Clinical Sciences Building, City Hospital, Hucknall Road, Nottingham, NG5 1PB, UK; .
- Received June 25, 2012
- Revised January 24, 2013
- Accepted January 29, 2013
- First published March 11, 2013.
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