Affiliation: | a Department of Anesthesiology, Japanese Red Cross Society Wakayama Medical Center, 4-20 Komatsubara-dori, Wakayama, Wakayama 640-8269, Japan b Department of Otorhinolaryngology, Japanese Red Cross Society Wakayama Medical Center, 4-20 Komatsubara-dori, Wakayama, Wakayama 640-8269, Japan c Department of Anesthesiology, Wakayama Medical University, 811-1 Kimiidera, Wakayama, Wakayama 641-0012, Japan |