Kearns, Benjamin
Whyte, Sophie
Seaman, Helen E
Snowball, Julia
Halloran, Stephen P
Butler, Piers
Patnick, Julietta
Nickerson, Claire
Chilcott, Jim
Article History
Received: 21 August 2015
Revised: 27 November 2015
Accepted: 4 December 2015
First Online: 14 January 2016
Competing interests
: The authors declare no conflict of interest.