1. Division of Internal Medicine and Thoracic Oncology; National Cancer Center Hospital; Tokyo; Japan
2. Division of Radiation Oncology; National Cancer Center Hospital; Tokyo; Japan
3. Department of Thoracic Oncology; Kanagawa Cancer Center; Yokohama; Japan
4. Division of Thoracic Oncology; National Cancer Center Hospital East; Kashiwa; Japan
5. Department of Medical Oncology, Division of Thoracic Oncology; Tochigi Cancer Center; Utsunomiya; Japan