- Correspondence to Prof Steven Cummins, Department of Social & Environmental Health Research, London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK;
- Received 4 September 2017
- Revised 6 September 2017
- Accepted 7 September 2017
- Published in print 22 September 2017.
- Published online 16 October 2017.
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