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Samuel Ern Hung, Tsan and Navian Lee, Viknaswaran and Jiaying, Lau and Chao, Chia Cheong and Chew, Yin Wang (2022) Effectiveness of preoxygenation during endotracheal intubation in a head-elevated position : a systematic review and meta-analysis of randomized controlled trials. Anaesthesiology Intensive Therapy, 54 (5). pp. 413-424. ISSN 1731-2531