1 Department of Anesthesiology and Critical Care Medicine, Asahikawa Medical University, Midorigaoka-higashi 2-1-1-1, Asahikawa, Hokkaido, 078-8510, Japan. Electronic address: h.kanda0629@nifty.com.
2 Department of Cardiac Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan.
3 Department of Anesthesiology and Critical Care Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan.