1. Staff Anesthesiologist, Mito Saiseikai General Hospital. Current address: Tsukuba University Hospital, Tsukuba, Ibaraki.
2. Instructor of Anesthesiology, Mito Saiseikai General Hospital.
3. Staff Anesthesiologist, Mito Saiseikai General Hospital.
4. Professor and Chairman of Anesthesiology, Institute of Clinical Medicine, Tsukuba University.