Hideki Taninishi1, Keishi Kawano, Kiyoshi Morita. 1. Department of Anesthesiology and Resuscitology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1, Shikata-cho, Kita-ku, Okayama, 700-8558, Japan, tanishi@ops.dti.ne.jp.