1 Department of Anesthesiology, Tokushima University Hospital, Tokushima, 2-50-1 Kuramoto-cho, Tokushima-shi, Tokushima, 770-8503, Japan. michiko-kinoshita@tokushima-u.ac.jp.
2 Department of Anesthesiology, Tokushima University Hospital, Tokushima, 2-50-1 Kuramoto-cho, Tokushima-shi, Tokushima, 770-8503, Japan.
3 Division of Operation Centre, Tokushima University Hospital, Tokushima, 2-50-1 Kuramoto-cho, Tokushima-shi, Tokushima, 770-8503, Japan.