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For many weeks now, we have all been wearing masks of different types and it is likely that we will have to live with their use for a longer time, perhaps months or years, at least until there is an effective vaccine against this new class of coronavirus . Many point to shortness of breath and summer will not help support the device better . The most anxious have been made with devices that measure blood oxygen. Not only to intercept the possible presence of Covid-19, which compromises respiratory function in the most serious forms, but also to understand if too much carbon dioxide circulates in the blood . But the mascari

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