PT - JOURNAL ARTICLE AU - Burhenne, H. J. TI - Canadian National Breast Screening Study DP - 1993 Jul 15 TA - Canadian Medical Association Journal PG - 137b--137 VI - 149 IP - 2 4099 - http://www.cmaj.ca/content/149/2/137b.short 4100 - http://www.cmaj.ca/content/149/2/137b.full SO - CMAJ1993 Jul 15; 149