1. Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, Gunma
2. World Health Organization Collaborating Center of Prevention and Control of Chronic Respiratory Diseases/Dokkyo University, Tochigi
3. Gunma University Faculty of Health Science, Gunma
4. 21st Century COE Program, Gunma University Faculty of Health Science, Gunma
5. Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Takasaki, Gunma
6. Department of General Surgical Science, Gunma University Graduate School of Medicine, Gunma
7. Divisiont of Thoracic and Visceral Organ Surgery, Gunma University Graduate School of Medicine, Gunma, Japan