Randomization The sample size for the following step was calculated considering 90% power to detect a 10-point difference in QoR-40, which indicated the need to include 31 participants in each group. Taking possible losses into consideration, the final sample will include 70 participants, which will be allocated to two groups according to a random number sequence from a web-based random-number generator (available at www.random.com). Because of significant difference between the anesthetic techniques, the patient and the investigators will be blinded to group allocation, but not the anesthesia. The anesthetic technique to be used for each individual participant will be kept in an opaque and sealed envelope, which will be opened at the time of surgery.