Experimental Intervention: Intubation will be by the attending anesthesiologist, who will choose the anesthetic, equipment, and intubating technique on clinical grounds. The anesthesiologists will be instructed to advance the tube to the depth of their choice. The cuff will be inflated to a measured pressure of 30cm water pressure, using a commercially available factory-calibrated device. After intubation, the patient's head will be placed resting on a small pillow in neutral position, and the patient will be randomized to CP or NP.