Funding for this research was provided by:
Public Health England (JGALAQR, JGALAQR)
Biotechnology and Biological Sciences Research Council (BB/M015033/1, BB/M015033/1)
Article History
Received: 8 December 2017
Accepted: 25 June 2018
First Online: 11 July 2018
Competing Interests
: The authors declare no competing interests.