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[Correspondence] Risk thresholds for alcohol consumption

We read the paper by Angela M Wood and colleagues1 (April 14, p 1513) on risk thresholds for alcohol consumption with great interest. However, we were surprised by their decision to eliminate non-drinkers from their analysis. We do not consider their justification for doing so scientifically valid; they eliminated non-drinkers because of notable differences in baseline characteristics compared with current drinkers.