Davies, Neil M. http://orcid.org/0000-0002-2460-0508
Dickson, Matt
Davey Smith, George
van den Berg, Gerard J.
Windmeijer, Frank
Article History
Received: 22 November 2016
Accepted: 5 December 2017
First Online: 29 January 2018
Competing interests
: The authors declare no competing interests.