“…The WHO also recommended strategies to optimize the availability of personal protective equipment [ 19 ]. Kirubarajan et al [ 20 ] revealed numerous strategies that had been evaluated for overcoming a limited supply of personal protective equipment during pandemics or epidemics. They grouped the strategies into six main categories: (1) decontamination of disposable masks [ 21 , 22 , 23 ], (2) reuse and/or extended wear of disposable masks [ 24 , 25 , 26 , 27 ], (3) layering of masks [ 28 , 29 ], (4) introduction of reusable respirators [ 29 , 30 ], (5) use of non-traditional replacements or modifications to masks [ 31 , 32 ], and (6) use of stockpiled or expired masks [ 33 , 34 , 35 ].…”