After induction of anesthesia, continuous neuromuscular monitoring is started after calibration and stabilization of the signal as recommended by good clinical research practice; 50 Hz tetanic stimulation for 5 s, calibration, stabilization for at least 2 min 2. After stabilization, rocuronium 0.6 mg/kg is administered IV within 5 s for tracheal intubation. Maintenance dose of 0.1-0.2 mg/kg rocuronium is administered as needed for the maintenance of PTC1-2 (deep block) or TOF1-2 (moderate block). At the end of surgery, sugammadex 4 mg/kg for deep block group or neostigmine 50 ㎍/kg with glycopyrrolate 10 ㎍/kg for moderate block group are administered IV for reversal of neuromuscular block.