- Correspondence to Dr James Donaldson, Division of Epidemiology & Public Health, University of Nottingham, Clinical Sciences Building, Nottingham City Hospital, Hucknall Road, Nottingham NG5 1PB, UK;
- Received April 12, 2013
- Revised August 24, 2013
- Accepted October 9, 2013
- First published November 4, 2013.
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