Corrigendum: Service evaluation of the impact of capnography on the safety of procedural sedation - Corbett, Gareth; Pugh, Peter; Herre, Jurgen; See, Teik Choon; de Monteverde-Robb, David; Torrejon Torres, Rafael; Saunders, Rhodri; Leonard, Catherine; Prakash, Amit (Frontiers in Medicine, 2022)