Clinical interventions to reduce secondhand smoke exposure among pregnant women: a systematic review
Van T Tong,
Patricia M Dietz,
Italia V Rolle,
Sara M Kennedy,
William Thomas,
Lucinda J England
Tobacco Control 2015;24:217-223 Published Online First: 30 April 2014doi:10.1136/tobaccocontrol-2013-051200
http://tobaccocontrol.bmj.com/content/24/3/217.full.pdf+html