1. Department of Thoracic Surgery Akita University Graduate School of Medicine Akita Japan
2. Department of Pathology Akita University Graduate School of Medicine Akita Japan
3. Akita Kousei Medical Center Akita Japan
4. Akita City Hospital Akita Japan
5. Japanese Red Cross Akita Hospital Akita Japan
6. Akita Industrial Technology Center Akita Japan
7. Department of Environmental Health Science and Public Health Akita University Graduate School of Medicine Akita Japan