- Correspondence to Professor Jill Pell, Henry Mechan Professor of Public Health, Institute of Health & Wellbeing, University of Glasgow, 1 Lilybank Gardens, Glasgow, G12 8RZ, UK;
- Received 7 July 2013
- Revised 12 November 2013
- Accepted 14 November 2013
- Published online 25 February 2014.
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