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letter . 1993 Mar 15;148(6):877, 880; 880-3.
Canadian National Breast Screening Study.
PMCID: PMC1490726 PMID: 8166772
See the article "Canadian National Breast Screening Study: 1. Breast cancer detection and death rates among women aged 40 to 49 years." in volume 147 on page 1459.
See the article "Canadian National Breast Screening Study: 2. Breast cancer detection and death rates among women aged 50 to 59 years." in volume 147 on page 1477.