Assessing secondhand smoke using biological markers
Erika Avila-Tang, Wael K Al-Delaimy, David L Ashley, Neal Benowitz, John T Bernert, Sungroul Kim, Jonathan M Samet, Stephen S Hecht
Tobacco Control May 2013, 22 (3) 164-171; DOI: 10.1136/tobaccocontrol-2011-050298