Staff involved in advising and/or recommending facemask restrictions (including chief medical officers) Their formal degrees and/or years of experience in the specialized fields of virology, epidemiology, transmission and/or prevention of transmission of infectious diseases, transmission of viruses and/or prevention of transmission of viruses. Oversight experience in formal training in phase 1, phase 2, phase 3 formal clinical trials of facemask use as to type (benefits and health risks - improper use, resuse of facemasks that haven't been washed, facial hair impact with respect to cloth facemasks and medical facemasks, microbial testing inside and outside of mask layers, reinoculation of viral bioaerosols from inhalation of expelled breath (facemask vs no facemask) Timeframe: December 1, 2019 - November 30, 2021
