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We have re-estimated overdiagnosis of breast cancer from mammography screening by age group in the Canadian National Breast Screening Study (CNBSS), a randomized screening trial. In the CNBSS, participants were recruited in 15 centers. 89,835 women were randomized with informed consent, 50,430 age 40–49 and 39,405 age 50–59. Women aged 40–49 received annual mammography and physical examination (MA+PX)...
To estimate the proportion of children living within walking distance who walk to school in Toronto, Canada and identify built and social environmental correlates of walking.Observational counts of school travel mode were done in 2011, at 118 elementary schools. Built environment data were obtained from municipal sources and school field audits and mapped onto school attendance boundaries. The influence...
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