Article Text
Matters arising
Coffee or decaff?
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This potentially valuable information about a relation between coffee consumption and the presence of rheumatoid factor1 is difficult to evaluate because of a lack of clarity in definitions. What is meant by “coffee”? Is coffee, caffeinated or decaffeinated? This is an obvious distinction that …
Dr Markku Heliövaara, National Public Health Institute, Mannerheimintie 166, FIN-00300 Helsinki, Finland markku.heliovaara{at}ktl.fi