Takashi Suzuki1, Shin-Ya Kimura2, Taketo Shinoda2. 1. Department of Anesthesiology, Showa University Koto Toyosu Hospital, 5-1-38, Toyosu, Koto-ku, Tokyo, 135-8577, Japan. tksuzuki@med.showa-u.ac.jp. 2. Department of Anesthesiology, Showa University Koto Toyosu Hospital, 5-1-38, Toyosu, Koto-ku, Tokyo, 135-8577, Japan.