TY - JOUR T1 - The Canadian National Breast Screening Study: opportunity for a rethink JF - Canadian Medical Association Journal JO - CMAJ SP - 1670 LP - 1672 VL - 148 IS - 10 AU - L. Mahoney Y1 - 1993/05/15 UR - http://www.cmaj.ca/content/148/10/1670.abstract ER -