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Assessing the effect of beard hair lengths on face masks used as personal protective equipment during the COVID-19 pandemic | Journal of Exposure Science & Environmental Epidemiology
Protocol of a prospective comprehensive evaluation of an elastic band beard cover for filtering facepiece respirators in healthcare | PLOS ONE
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Hair today, gone tomorrow: How personal protective equipment guidance changed doctor's facial hair during the COVID‐19 pandemic - Sahota - 2021 - Health Science Reports - Wiley Online Library
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Under-mask beard cover (Singh Thattha technique) for donning respirator masks in COVID-19 patient care - ScienceDirect
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