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.