Comparing performance of i-gel Plus and AuraGain for fiberoptic intubation

INTERVENTION: D007442 i‐gel Plus or AuraGain are inserted after induction of general anesthesia according to randomization. Tracheal intubation with fiberscope is performed using supraglottic airway device as a guide. Tracheal intubation CONDITION: D000768 General anesthesia General anesthesia ; General anesthesia PRIMARY OUTCOME: Time needed for the success of tracheal intubation SECONDARY OUTCOME: Time needed for the visual confirmation of vocal folds and tracheal bifurcation, fiberoptic view of vocal cords, difficulty intubation score INCLUSION CRITERIA: Patients who undergo cervical surgery under general anesthesia with tracheal intubation