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Matters arising
Coffee consumption, RF, and the risk of RA
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Stress is one of the factors that can trigger the onset of rheumatoid arthritis (RA). People working under deadline pressure, and people characterised as hard driving, “type A” personalities may be most likely to experience stress. These are the same people who may consume large quantities of coffee in order to stay at peak performance for longer periods of time. Possibly, therefore, the correlation reported by Heliövaara et al 1between coffee consumption and RA may, in part, be due to the association between stress and RA.
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Authors' reply
The plausible hypothesis presented by Dr Glaser prompted us to complement our earlier results with a further analysis of data …