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Coffee brewing technique as a confounder in observational studies

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  • Twitter Follow Christopher Hingston at @chris__hingston

  • Contributors Both authors contributed equally to the preparation of this manuscript, have agreed the content and this manuscript consists of our own work and ideas.

  • Competing interests None declared.

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

  • Data sharing statement The manuscript may be distributed as the journal sees fit.

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