Electronic cigarette use among adult population: a cross-sectional study in Barcelona, Spain (2013–2014)
Jose M Martínez-Sánchez, Montse Ballbè, Marcela Fu, Juan Carlos Martín-Sánchez, Esteve Saltó, Mark Gottlieb, Richard Daynard, Gregory N Connolly, Esteve Fernández
BMJ Open Aug 2014, 4 (8) e005894; DOI: 10.1136/bmjopen-2014-005894