Experimental Assessment of Carbon Dioxide Content in Inhaled Air With or Without Face Masks in Healthy Children A Randomized Clinical Trial by Harald Walach, PhD, Ronald Weikl, MD and Juliane Prentice, BA JAMA Pediatr. published online June 30, 2021, doi:10.1001/jamapediatrics.2021.2659 Many governments have made nose and mouth covering or face masks compulsory for schoolchildren.
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