Pestei, S. K., A. Orandi, N. Eftekhar, A. P. Zanjani, H. R. Amiri, and M. Abedi Firuzjaee. “Comparison of the Effect of Propofol Plus IV Lidocaine Versus Propofol Plus Topical Lidocaine Spray on Decreasing Gag Reflex in Upper GI Endoscopy: A Clinical Trial”. Archives of Anesthesiology and Critical Care, Vol. 6, no. 1, Dec. 2019, pp. 27-32, doi:10.18502/aacc.v6i1.2046.