1 Department of Anesthesiology, The Jikei University School of Medicine, 2‑25‑8 Nishishinbashi, Minato‑Ku, Tokyo, 105‑8461, Japan.
2 Department of Anesthesiology, The Jikei University School of Medicine, 2‑25‑8 Nishishinbashi, Minato‑Ku, Tokyo, 105‑8461, Japan. tsunetann@gmail.com.