- Correspondence to Dr Clare Tanton, Research Department of Infection & Population Health, University College London, 3rd floor Mortimer Market Centre, off Capper Street, London WC1E 6JB, UK;
- Received 12 November 2015
- Revised 26 January 2016
- Accepted 6 February 2016
- Published in print 1 September 2016.
- Published online 19 August 2016.
- Published first 6 June 2016.
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