Siau, Keith, Jessie Li, Neil C. Fisher, Chris J.J. Mulder, and Sauid Ishaq. 2017. “Intubation Failure During Gastroscopy: Incidence, Predictors and Follow-Up Findings”. Journal of Gastrointestinal and Liver Diseases 26 (4):339-44. https://doi.org/10.15403/jgld.2014.1121.264.isq.