Palmer, T J
McFadden, M
Pollock, K G J
Kavanagh, K
Cuschieri, K
Cruickshank, M
Nicoll, S
Robertson, C
Article History
Received: 10 September 2015
Revised: 3 December 2015
Accepted: 4 December 2015
First Online: 22 January 2016
Competing interests
: MC has been a member of an Advisory Board (Sanofi Pasteur MSD) and has been an investigator for studies sponsored and funded by GlaxoSmithKline via her institution.The remaining authors declare no conflict of interest.