Hansson, Erik
Forbes, Harriet J
Langan, Sinéad M
Smeeth, Liam
Bhaskaran, Krishnan
Article History
Received: 13 December 2016
Revised: 22 March 2017
Accepted: 10 April 2017
First Online: 2 May 2017
Competing interests
: The authors declare no conflict of interest.