TY - JOUR T1 - Prison smoking bans: clearing the air JF - Canadian Medical Association Journal JO - CMAJ SP - E474 LP - E474 DO - 10.1503/cmaj.109-4486 VL - 185 IS - 10 AU - Roger Collier Y1 - 2013/07/09 UR - http://www.cmaj.ca/content/185/10/E474.abstract N2 - ER -