Nami Kakuta1, Shiho Satomi2, Yasuo M Tsutsumi2. 1. Department of Anesthesiology, Tokushima University, 3-18-15, Kuramoto, Tokushima, 770-8503, Japan. kakuta.nami@tokushima-u.ac.jp. 2. Department of Anesthesiology and Critical Care, Hiroshima University, Hiroshima, Japan.