Affiliation: | (1) Mito English Center, Ibaraki, Japan;(2) Department of Anesthesia, Mito Saiseikai General Hospital, Mito, Japan;(3) Institute of Clinical Medicine, The University of Tsukuba, Ibaraki, Japan;(4) Department of Anesthesia, Mito Saiseikai General Hospital, 3-3-10 Futabadai, Mito, Ibaraki, 311-41, Japan |