Nature and Preoperative Prediction of Difficult Non-Channeled Video-Laryngoscopic Tracheal Intubation in Otorhinolaryngological Surgery: A Retrospective Cohort Study of 1932 Adults - Darhae Eum; Hyoung Woo Chang; Myoung Hwa Kim; Jinmok Kim; Wyun Kon Park; Hyun Joo Kim (Journal of Clinical Medicine, 2026)