1 Department of Anesthesiology and Intensive Care, Hamamatsu University Hospital, 1-20-1 Handayama Higashi-ku Hamamatsu-shi, Hamamatsu, Shizuoka, 431-3192, Japan. cnaka@hama-med.ac.jp.
2 Department of Anesthesiology and Intensive Care, Hamamatsu University Hospital, 1-20-1 Handayama Higashi-ku Hamamatsu-shi, Hamamatsu, Shizuoka, 431-3192, Japan.