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. 2020 Sep 23;52(10):928–929. doi: 10.1055/a-1198-5471

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This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 1 — Mitigation of aerosol infection risk during upper gastrointestinal endoscopy: simple construction of the “double surgical mask with slit.” a Two individual universal surgical masks. b The masks are taped together to form a double surgical mask. c A narrow slit (length 1.2 cm) is cut through the double mask, using scissors.