?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Callender%2C+Thomas&rft.aufirst=Thomas&rft.aulast=Callender&rft.date=25+February+2025&rft.atitle=Screening+for+multiple+cancers%3A+evaluation+must+go+beyond+aggregate+measures&rft.volume=388&rft.issn=0959-535X&rft.title=The+BMJ&rft.genre=article