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Wang, C.Y. and Ling, L.C. and Cardosa, M.S. and Wong, A.K.H. and Wong, N.W. (2001) Hypoxia during upper gastrointestinal endoscopy with and without sedation and the effect of pre-oxygenation on oxygen saturation. Anaesthesia, 55 (7). pp. 654-658. ISSN 0003-2409, DOI https://doi.org/10.1046/j.1365-2044.2000.01520.x.