Data were collected on women in Korea who were newly diagnosed patients with primary breast cancer between January 1, 2013 and December 31, 2013. A nationwide questionnaire survey was used for the total number of patients newly diagnosed with breast cancer (including ductal carcinoma in situ [DCIS] and invasive breast cancer), and the age of these patients. A total of 99 hospitals answered this questionnaire (See the Supple-
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Min et al. (2016) studied this question.
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