TY - JOUR T1 - Unnecessary exposure? JF - Canadian Medical Association Journal JO - CMAJ SP - 500 LP - 500-a DO - 10.1503/cmaj.060066 VL - 174 IS - 4 AU - John Hoey Y1 - 2006/02/14 UR - http://www.cmaj.ca/content/174/4/500.2.abstract ER -