Malaithong, W., S. Munjupong, N. Boongungwan, and E. Chantrapannik. “Efficacy of Intravenous 0.25 mg/kg Lidocaine Compared with 0.5 mg/kg Lidocaine for Reducing Fentanyl-Induced Cough: a Randomized Controlled Trial”. Thai Journal of Anesthesiology, vol. 48, no. 4, Oct. 2022, pp. 265-72, https://he02.tci-thaijo.org/index.php/anesthai/article/view/259543.