- Correspondence to Peter Weatherburn, Sigma Research, Department of Social and Environmental Health Research, London School of Hygiene & Tropical Medicine, 15-17 Tavistock Place, London, WC1H 9SH, UK;
- Received 16 November 2016
- Revised 26 June 2017
- Accepted 2 July 2017
- Published online 4 August 2017.
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