1. Department of Thoracic Oncology, National Cancer Center Hospital East , Kashiwa , Japan
2. Department of Thoracic Oncology and Respiratory Medicine, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital , Tokyo , Japan
3. Department of Respiratory Medicine, Kitasato University School of Medicine , Kanagawa , Japan
4. Department of Thoracic Oncology, National Cancer Center Hospital , Tokyo , Japan