1 Department of Respiratory Medicine, Japanese Red Cross Okayama Hospital, Okayama, Japan.
2 Department of Allergy and Respiratory Medicine, Okayama University Hospital, Okayama, Japan.
3 Department of Thoracic Oncology, National Hospital Organization Shikoku Cancer Center, Matsuyama, Japan.
4 Department of Respiratory Medicine, Ehime Prefectural Central Hospital, Matsuyama, Japan.
5 Department of Respiratory Medicine, National Hospital Organization Okayama Medical Center, Okayama, Japan.
6 Department of Respiratory Medicine, Himeji Red Cross Hospital, Himeji, Japan.
7 Department of Internal Medicine, Okayama Saiseikai General Hospital, Okayama, Japan.
8 Department of General Internal Medicine 4, Kawasaki Medical School, Okayama, Japan.
9 Department of Internal Medicine, Fukuyama City Hospital, Fukuyama, Japan.
10 Department of Hematology, Oncology and Respiratory Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama, Japan.
11 Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama, Japan.