Koshiaris, C
Aveyard, P
Oke, J
Ryan, R
Szatkowski, L
Stevens, R
Farley, A
Article History
Received: 23 January 2017
Revised: 26 April 2017
Accepted: 26 May 2017
First Online: 12 September 2017
Competing interests
: Three of our authors report potential conflicts of interest, and the remaining four do not have any to report. The potential conflicts are as follows: Paul Aveyard reports grants from MRC, NIHR, CRUK, ESRC, and UK Centre for Tobacco and Alcohol Studies during the conduct of this study; Amanda Farley reports grants from the NIHR and CRUK during the conduct of this study; Ronan Ryan reports that he was part-funded by the National Health Service (Heart of England NHS Foundation Trust) during the conduct of this study.The funder was not involved in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript. The views expressed are those of the authors and not necessarily those of the NIHR, the NHS or the Department of Health.