Do provincial policies banning smoking in cars when children are present impact youth exposure to secondhand smoke in cars?

Citation:

Elton-Marshall, T. , Leatherdale, S. T. , Driezen, P. , Azagba, S. , & Burkhalter, R. . (2015). Do provincial policies banning smoking in cars when children are present impact youth exposure to secondhand smoke in cars?. Preventive Medicine, 78, 59–64. doi:10.1016/j.ypmed.2015.07.007