Electronic-cigarette use among young people in Wales: evidence from two cross-sectional surveys
Graham Moore, Gillian Hewitt, John Evans, Hannah J Littlecott, Jo Holliday, Nilufar Ahmed, Laurence Moore, Simon Murphy, Adam Fletcher
BMJ Open Apr 2015, 5 (4) e007072; DOI: 10.1136/bmjopen-2014-007072