Why not use the Easybreath snorkeling mask to prevent COVID-19 transmission during endoscopy procedures when FFP2 are lacking? - Rivory, Jérôme; Beaugendre, Éric; Yvon, Claire; Ploteau, Fréderic; Condat, Bertrand; Rostain, Florian; Pioche, Mathieu (Endoscopy, 2020)