1. Department of Pulmonary Medicine Hakodate Goryoukaku Hospital Hakodate Japan
2. Department of Respiratory Medicine and Allergology Sapporo Medical University School of Medicine Sapporo Japan
3. Department of Thoracic Surgery Hakodate Goryoukaku Hospital Hakodate Japan
4. Division of Radiology Hakodate Goryoukaku Hospital Hakodate Japan