1. Department of Thoracic Oncology & Respiratory Medicine, Tokyo Metropolitan Cancer & Infectious Diseases Center, Komagome Hospital, Bunkyo, Tokyo, Japan
2. Department of Pulmonary Medicine & Oncology, Graduate School of Medicine, Nippon Medical School, Tokyo, Japan
3. Department of Pathology, Tokyo Metropolitan Cancer & Infectious Diseases Center, Komagome Hospital, Bunkyo, Tokyo, Japan