Media type: E-Article Title: E-cigarettes and equity: a systematic review of differences in awareness and use between sociodemographic groups Contributor: Hartwell, Greg; Thomas, Sian; Egan, Matt; Gilmore, Anna; Petticrew, Mark Published: BMJ, 2017 Published in: Tobacco Control, 26 (2017) e2, Seite e85-e91 Language: English DOI: 10.1136/tobaccocontrol-2016-053222 ISSN: 0964-4563; 1468-3318 Origination: Footnote: