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2. Prevention of hypoxaemia during upper-gastrointestinal endoscopy by means of oxygen via nasal cannulae;Bell, G.D.; Brown, S.; Morden, A.; Coady, T.; Logan, R.F.A.;Lancet,1987
3. Arterial oxygen saturation during upper gastrointestinal endoscopy: influence of sedation and operator experience;Lavies, N.G.; Creasy, T.; Harris, K.; Hanning, C.D.;AmJ Gastroenterol,1988
4. Review article: premedication and intravenous sedation for upper gastrointestinal endoscopy;Bell, G.D.;Aliment Pharmacol Therapeut,1990
5. Effect of intranasal oxygen on hypoxia and tachycardia during endoscopic cholangiopancreatography;Griffin, S.M.; Chung, S.C.S.; Leung, J.W.C.; Li, A.K.C.;BMJ,1990