M. S. Hossain, M. Rashid, A. R. Babu, D. Saha, and D. Banik, “Betamethasone Gel versus Intravenous Dexamethasone as Prophylaxis against Postoperative Sore Throat”, Delta Med Col J, vol. 6, no. 2, pp. 73–77, Sep. 2018.