G. D. Batty, Gale, C. R., Jefferis, B., and Kvaavik, E.,
“Passive smoking assessed by salivary cotinine and self-report in relation to cause-specific mortality: 17-year follow-up of study participants in the UK Health and Lifestyle Survey.”,
J Epidemiol Community Health, vol. 68, no. 12, pp. 1200-3, 2014.