Kumaratat, Nattaya, and Srisuda Assawapalanggool. 2022. “Efficiency of Tissue Biopsies in the Larynx and Hypopharynx: A Comparative Study Between the Use of Transnasal Flexible Laryngoscope Versus Direct Laryngoscope”. Journal of The Department of Medical Services 47 (3):42-50. https://he02.tci-thaijo.org/index.php/JDMS/article/view/255746.