Anesthetic technique will be standardized in all studied. After breathing 100% oxygen for 3 min through a facemask in a neutral position, anesthesia will be induced with fentanyl 2-3µg/kg/min and propofol 2-3 mg/kg to achieve a SE < 50 and the difference between RE and SE less than 10. Rocuronium 0.6 mg.kg will be administered for complete relaxation on the TOF (TOF-GE, Datex-Ohmeda Division, Instrumentarium Corporation, Helsinki, Finland). Anesthesia will be maintained using sevoflurane end-tidal concentrations of 2.5-3.5% in oxygen via a bag-mask for 3 min before endotracheal intubation.