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Letters
Biliary tract cancer in male printers and typesetters in the European rare cancer case-control study
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Footnotes
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Contributors WA conducted the analyses, all authors designed the study, assessed results and wrote the letter.
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Competing interests None.
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Patient consent Obtained.
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Ethics approval Multicentric study: all participating countries and centres obtained approval by the appropriate independent ethical Committee.
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Provenance and peer review Not commissioned; internally peer reviewed.