- Correspondence to Dr Katie Harron, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK;
- Received 8 August 2016
- Accepted 30 August 2016
- Published in print 1 May 2017.
- Published online 19 April 2017.
- Published first 8 October 2016.
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