RT Journal Article SR Electronic T1 Radiation dose and protection JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E240 OP E240 DO 10.1503/cmaj.090754 VO 184 IS 4 A1 Mark O. Baerlocher A1 Stefanie Leung A1 Murray Asch A1 Andy Myers YR 2012 UL http://www.cmaj.ca/content/184/4/E240.abstract