Impact of smoking on health system costs among cancer patients in a retrospective cohort study in Ontario, Canada
Wanrudee Isaranuwatchai, Claire de Oliveira, Nicole Mittmann, William K (Bill) Evans, Alice Peter, Rebecca Truscott, Kelvin KW Chan
BMJ Open Jun 2019, 9 (6) e026022; DOI: 10.1136/bmjopen-2018-026022