Ahmed, N., Moore, G., Hewitt, G., Evans, J., Littlecott, H. J., Holliday, J., . . . Fletcher, A. (2015). Electronic-cigarette use among young people in Wales: Evidence from two cross-sectional surveys. BMJ Open, 5(4), p. e007072. doi:10.1136/bmjopen-2014-007072

Ahmed, Nilufar, et al. "Electronic-cigarette Use Among Young People in Wales: Evidence From Two Cross-sectional Surveys." BMJ Open 5, no. 4 (2015): e007072.

Ahmed, Nilufar, et al. "Electronic-cigarette Use Among Young People in Wales: Evidence From Two Cross-sectional Surveys." BMJ Open 5.4 (2015): e007072.