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https://twitter.com/CochraneLibrary/status/1393170994026713088?s=20is based on modelling and observational studies. In other words, LOW level of evidence. The #Covid era has trashed well-established standards and practices. What does this mean? cc @RecheckHealth @CatherineRiva (2/4) Throughout this crisis, public health authorities put the world in stand-by without knowing if that would make sense. Instead of quality studies to assess the effectiveness of non-pharmaceutical interventions, we are left with low level of evidence. #evidencefreepandemic