Yuichi Ohgoshi1, Hitoshi Izawa2, Shoichi Kori3, Masakazu Matsukawa3. 1. Department of Anesthesiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan. ohgoshi22@gmail.com. 2. Department of Anesthesiology, Tokyo General Hospital, Tokyo, Japan. 3. Department of Anesthesiology, International University of Health and Welfare Mita Hospital, Tokyo, Japan.