- Correspondence to David Mesher, Public Health England, Centre for Infectious Disease Surveillance and Control, 61 Colindale Avenue, London NW9 5EQ, UK;
- Received 16 March 2016
- Revised 8 June 2016
- Accepted 11 June 2016
- Published in print 1 March 2017.
- Published online 17 February 2017.
- Published first 30 June 2016.
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