Comparison of Oral Preoperative Clonidine with Infusion of Intraoperative Labetalol on Bleeding during Tympanoplasty Surgery. - Afzalzadeh, Mohamad Reza; Mahdavi, Mostafa; Asghari, Saleheh; Emadzadeh, Maryam (Iranian Journal of Otorhinolaryngology, 2025)