Hossain, M.S. et al. 2019. A Comparison of Effectiveness f Betamethasone Gel and Lignocaine Jelly Applied to Tracheal Tube on Postoperative Sore Throat. Faridpur Medical College Journal. 13, 2 (Oct. 2019), 58–61. DOI:https://doi.org/10.3329/fmcj.v13i2.43621.