Breast cancer screening in women under 50.
D000328:Adult; D000367:Age Factors; D001943:Breast Neoplasms / Q000000981:diagnostic imaging* / Q000401:mortality; D002170:Canada; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D008327:Mammography / Q000009:adverse effects / Q000592:standards; D008875:Middle Aged; D011643:Publishing; D012107:Research Design