1. Instructor of Anesthesiology, Hokkaido University School of Medicine.
2. Assistant Professor of Anesthesiology, Hokkaido University School of Medicine.
3. Associate Professor of Anesthesiology, Hokkaido University School of Medicine.
4. Professor and Chairman of Anesthesiology, Hokkaido University School of Medicine.
5. Instructor of Anesthesiology, Hiroshima University School of Medicine.