Masks work. 😷 facebook.com/DrJasonBegalke…
@spinnershells nature.com/articles/s4159… healthaffairs.org/doi/10.1377/hl… researchgate.net/publication/34… cmaj.ca/content/192/15… washingtonpost.com/business/2020/…
@spinnershells ncbi.nlm.nih.gov/sites/entrez?c… pubmed.ncbi.nlm.nih.gov/20584862/ ncbi.nlm.nih.gov/sites/entrez?c… ncbi.nlm.nih.gov/sites/entrez?c…… twitter.com/i/web/status/1…