title: Response to Kopans.
authors.forename: J M
authors.initials: JM
authors.lastname: Elwood
authors.forename: B
authors.initials: B
authors.lastname: Cox
authors.forename: A K
authors.initials: AK
authors.lastname: Richardson
mesh_terms: D000328:Adult; D000367:Age Factors; D001943:Breast Neoplasms / Q000000981:diagnostic imaging* / Q000401:mortality / Q000517:prevention & control; D005260:Female; D006801:Humans; D008327:Mammography; D008403:Mass Screening; D015201:Meta-Analysis as Topic; D008875:Middle Aged; D016032:Randomized Controlled Trials as Topic; D015996:Survival Rate