- Correspondence to Dr Kate L Mandeville, Department of Global Health and Development, London School of Hygiene and Tropical Medicine, 15-17 Tavistock Place, London WC1H 9SH, UK;
- Received 17 July 2013
- Revised 7 September 2013
- Accepted 18 September 2013
- Published in print 30 October 2013.
- Published online 11 November 2013.
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