1 Department of Anesthesiology and ICM, Kawasaki Medical School Hospital, 577 Matsushima, Kurashiki, Okayama, 7010192, Japan. fujitay@med.kawasaki-ma.ac.jp.
2 Department of Anesthesia, Iwaki Kyoritsu General Hospital, Iwaki, Japan. fujitay@med.kawasaki-ma.ac.jp.
3 Department of Anesthesiology and ICM, Kawasaki Medical School Hospital, 577 Matsushima, Kurashiki, Okayama, 7010192, Japan.