- Correspondence to Dr Phil Edwards, Department of Population Health, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK;
- Received 6 May 2015
- Revised 2 June 2015
- Accepted 3 June 2015
- Published in print 8 July 2015.
- Published online 28 July 2015.
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