[1] Kawasaki Med Sch, Dept Gen Internal Med 4, Okayama, Japan
[2] Okayama Univ Hosp, Dept Allergy & Resp Med, Okayama, Japan
[3] Natl Hosp Org Shikoku Canc Ctr, Dept Thorac Oncol, Shikoku, Ehime, Japan
[4] Ehime Prefectural Cent Hosp, Dept Resp Med, Matsuyama, Ehime, Japan
[5] Natl Hosp Org Okayama Med Ctr, Dept Resp Med, Okayama, Japan
[6] Japanese Red Cross Okayama Hosp, Dept Resp Med, Okayama, Japan
[7] Himeji Red Cross Hosp, Dept Resp Med, Himeji, Hyogo, Japan
[8] Okayama Saiseikai Gen Hosp, Dept Internal Med, Okayama, Japan
[9] Fukuyama City Hosp, Dept Resp Med, Fukuyama, Hiroshima, Japan
[10] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Hematol Oncol & Resp Med, Okayama, Japan
[11] Okayama Univ Hosp, Ctr Innovat Clin Med, Okayama, Japan