- Correspondence to Dr Theo Lorenc, Department of Social & Environmental Health Research, London School of Hygiene & Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK;
- Accepted 20 July 2012
- Published in print 1 February 2013.
- Published online 6 January 2013.
- Published first 8 August 2012.
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