1. Division of Respiratory Medicine; Gunma Prefectural Cancer Center; Ohta Japan
2. Division of Respiratory Medicine; Ibaraki Prefectural Central Hospital; Kasama Japan
3. Department of Pulmonary Medicine; Fukushima Medical University; Fukushima Japan
4. Division of Thoracic Oncology; Tochigi Cancer Center; Utsunomiya Japan
5. Department of Respiratory Medicine; Comprehensive Cancer Center, International Medical Center, Saitama Medical University; Hidaka Japan
6. Clinical Oncology Center; Fukushima Medical University Hospital; Fukushima Japan