Breast screening in women under 50.
D000328:Adult; D000367:Age Factors; D001943:Breast Neoplasms / Q000401:mortality / Q000517:prevention & control*; D002170:Canada; D002423:Cause of Death; D005260:Female; D006801:Humans; D008327:Mammography / Q000592:standards*; D008403:Mass Screening / Q000592:standards*; D008875:Middle Aged