Hideaki Ebana1, Shinju Obara2, Masahiro Murakawa3. 1. Department of Anesthesiology, Fukushima Medical University School of Medicine, 1 Hikarigaka, Fukushima, Fukushima, 960-1295, Japan. eva06111@gmail.com. 2. Surgical Operation Department, Fukushima Medical University Hospital, 1 Hikarigaoka, Fukushima, Fukushima, 960-1295, Japan. 3. Department of Anesthesiology, Fukushima Medical University School of Medicine, 1 Hikarigaoka, Fukushima, Fukushima, 960-1295, Japan.