* Graduate student, ‡ Staff anesthesiologist, ∥ Professor and chair, Department of Anesthesiology, § Associate professor, Department of Otolaryngology, Chiba University Graduate School of Medicine. † Anesthetist-in-chief, Department of Anesthesia, Saiseikai Narashino General Hospital.
Received from the Department of Anesthesiology, Chiba University Graduate School of Medicine, Chiba, Japan.