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The study makes the assumption that it is reasonable to gather together studies from the other two major coronavirus epidemics of the last 20 years — SARS and Middle East Respiratory Syndrome — and to combine these with the relatively limited data so far available about the effects of Covid-19 upon mental health, it is probably legitimate to do so, but a casual glance at the paper may suggest that the paper is mainly about Covid-19, whereas most of the data come from the earlier virus outbreaks.