1. Department of Hematology, Oncology, and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan;
2. Center of Innovative Clinical Medicine, Okayama University Hospital, Okayama, Japan;
3. Department of Allergy and Respiratory Medicine, Okayama University Hospital, Okayama, Japan;
4. Division of Cancer Epidemiology and Prevention, Department of Preventive Medicine, Aichi Cancer Center Research Institute, Nagoya, Japan;
5. Department of Respiratory Medicine, Yamaguchi Ube Medical Center, Ube, Japan;
6. Department of Respiratory Medicine, Kure Kyosai Hospital, Kure, Japan;
7. Health Service Center, Okayama University, Okayama, Japan;
8. Center for Clinical Oncology, Okayama University Hospital, Okayama, Japan;
9. Department of Respiratory Medicine, Okayama Medical Center, Okayama, Japan