1. Department of Respiratory Medicine Gunma University Graduate School of Medicine Maebashi Gunma Japan
2. Oncology Center Gunma University Hospital Maebashi Gunma Japan
3. Department of General Surgical Science Gunma University Graduate School of Medicine Maebashi Gunma Japan
4. Department of Radiation Oncology Gunma University Graduate School of Medicine Maebashi Gunma Japan
5. Gunma University Graduate School of Health Sciences Maebashi Gunma Japan