Akari Yoshida1, Saori Kurata1, Kotaro Kida1, Tsunehisa Tsubokawa2. 1. Department of Anesthesiology, School of Medicine, The Jikei University, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo, Japan. 2. Department of Anesthesiology, School of Medicine, The Jikei University, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo, Japan. tsunetann@gmail.com.