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Coffee brewing technique as a confounder in observational studies
  1. Christopher D Hingston,
  2. Matt P Wise
  1. Department of Adult Critical Care, University Hospital of Wales, Cardiff, South Glamorgan, UK
  1. Correspondence to Dr Christopher D Hingston, Department of Critical Care Directorate, University Hospital of Wales, Heath Park, Cardiff CF14 4XW, UK; chris{at}

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Choi et al1 describe an association between moderate coffee consumption and lower prevalence of subclinical coronary atherosclerosis. This is consistent with a growing body of evidence that supports this finding. A similar, large prospective study of over 400 000 participants demonstrated that coffee consumption was inversely associated with both total and cause-specific mortality, specifically …

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