Cancer Surveillance and Outcomes (AC
NP) and Screening Mammography Program of BC (CW), BC Cancer Agency, Vancouver, British Columbia; Screening Programs, Cancer Care Manitoba, Winnipeg, Manitoba (KD); Ontario Breast Screening Program, Cancer Care Ontario, Toronto, Ontario (AMC); Québec Breast Cancer Screening Program, Institut National de Santé Publique du Québec, Quebec City, Quebec (JB); New Brunswick Breast Cancer Screening Services Program, Fredericton, New Brunswick (BZ); Nova Scotia Breast Screening Program, Halifax, Nova Scotia (JP); Newfoundland and Labrador Breast Screening Program, Eastern Health, St. John's, Newfoundland (GD); Public Health Agency of Canada, Ottawa, Ontario (RA).