Randomization
An independent research coordinator used SPSS (Version 23.0) to make randomized number sequence and prepared sealed and opaque envelopes according to the number sequence. Anesthesiologists assigned eligible patients using these envelopes before anesthesia induction. Patients were randomly assigned to either intraoperative THRIVE followed by mechanical ventilation through a LM for post-anesthesia care (THRIVE + LM) group or mechanical ventilation through an endotracheal tube for both intraoperative and post-anesthesia care periods (MV + ETT) group. The allocation ratio was 1:1. The randomization schedule was stratified into blocks of 4. All randomized patients received the protocolized study intervention according to their allocation. Patients, investigators who interview patients for QoR-40 and VHI, and data analysts are blinded to group allocation. Since anesthesiologists, otolaryngologists, and post-anesthesia care providers (outcome assessors) cannot be blinded due to the obvious difference in ventilation strategies between the THRIVE + LM group and the MV + ETT group, none of them are invited as investigators of this study, so they are not interested parties.