Davies, Nicholas G. http://orcid.org/0000-0002-1740-1412
Flasche, Stefan http://orcid.org/0000-0002-5808-2606
Jit, Mark http://orcid.org/0000-0001-6658-8255
Atkins, Katherine E. http://orcid.org/0000-0001-5250-0558
Article History
Received: 2 January 2018
Accepted: 11 December 2018
First Online: 11 February 2019
Competing interests
: The authors declare no competing interests.