1. Department of Respiratory Medicine, Hamamatsu Medical Center, 328 Tomitsuka-cho, Naka-ku, Hamamatsu, Shizuoka 432-8580, Japan
2. Internal Medicine III, Wakayama Medical University, Wakayama City, Wakayama 641-0012, Japan
3. Internal Medicine III, Wakayama Medical University, Wakayama City, Wakayama, Japan
4. Center for Biomedical Sciences, Wakayama Medical University, Wakayama City, Wakayama, Japan
5. Department of Respiratory Medicine, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
6. Department of Respiratory Medicine, National Hospital Organization Okinawa National Hospital, Ginowan, Okinawa, Japan
7. Department of Respiratory Medicine, Comprehensive Cancer Center, Saitama Medical University International Medical Center, Hidaka, Saitama, Japan
8. Department of Internal Medicine, National Hospital Organization Kinki-chuo Chest Medical Center, Sakai City, Osaka, Japan
9. Center for Clinical Oncology, Okayama University Hospital, Okayama, Okayama, Japan
10. Department of Thoracic Oncology, Kanagawa Cancer Center, Yokohama, Kanagawa, Japan
11. Department of Biostatistics, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, Japan