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. 2023 May 8;13(5):e066524. doi: 10.1136/bmjopen-2022-066524

Figure 2.

Figure 2

Reported comfort (primary) and safety (secondary) outcomes for Bubble-PAPR versus usual FFP3 face masks. FFP, filtering face piece; PAPR, powered air-purifying respirator; PPE, personal protective equipment.