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Biliary tract cancer in male printers and typesetters in the European rare cancer case-control study

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  • Contributors WA conducted the analyses, all authors designed the study, assessed results and wrote the letter.

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval Multicentric study: all participating countries and centres obtained approval by the appropriate independent ethical Committee.

  • Provenance and peer review Not commissioned; internally peer reviewed.