1. Communal Laboratory, Research Institute, National Center for Global Health and Medicine, Tokyo 162-8655, Japan
2. Department of Surgery, National Center for Global Health and Medicine, Tokyo 162-8655, Japan
3. Department of Thoracic Surgery, National Center for Global Health and Medicine, Tokyo 162-8655, Japan
4. Pathology Division of Clinical Laboratory, National Center for Global Health and Medicine, Tokyo 162-8655, Japan