title: Screening trials are even more difficult than we thought they were.
authors.forename: Helen G
authors.initials: HG
authors.lastname: Juffs
authors.forename: Ian F
authors.initials: IF
authors.lastname: Tannock
mesh_terms: D015982:Bias; D001943:Breast Neoplasms / Q000175:diagnosis / Q000453:epidemiology; D002423:Cause of Death; D005260:Female; D006801:Humans; D008297:Male; D008327:Mammography / Q000706:statistics & numerical data; D008403:Mass Screening / Q000379:methods*; D009369:Neoplasms / Q000175:diagnosis* / Q000453:epidemiology / Q000401:mortality*; D011471:Prostatic Neoplasms / Q000175:diagnosis / Q000453:epidemiology; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity