1 Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Yanagido 1-1, 501-1194, Gifu, Gifu, Japan. iida@gifu-u.ac.jp.
2 Department of Anesthesiology and Pain Medicine, Gifu University Graduate School of Medicine, Yanagido 1-1, 501-1194, Gifu, Gifu, Japan.