- Correspondence to Dr Emma O'Dowd, Division of Public Health and Epidemiology, University of Nottingham, Room C100, Clinical Sciences Building, Nottingham City Campus, Hucknall Road, Nottingham NG5 1PB, UK; firstname.lastname@example.org
- Received 7 May 2014
- Revised 22 July 2014
- Accepted 7 August 2014
- Published in print 12 September 2014.
- Published online 13 October 2014.
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