Affiliation: | (1) Department of Anesthesiology, Yamagata Prefectural Kahoku Hospital, 111 Gassando, Yachi, Kahoku-cho, Nishi-Murayama, Yamagata, 999-3511, Japan;(2) Department of Anesthesia and Resuscitation, Yamagata University School of Medicine, Yamagata, Japan |