[1] Okayama Univ, Dept Hematol Oncol & Resp Med, Grad Sch Med Dent & Pharmaceut Sci, Okayama 7008558, Japan
[2] Okayama Univ Hosp, Okayama 7008558, Japan
[3] Natl Hosp Org, Shikoku Canc Ctr, Dept Med & Thorac Oncol, Matsuyama, Ehime 7910288, Japan
[4] Okayama Red Cross Hosp, Dept Internal Med, Okayama 7008607, Japan
[5] Sumitomo Besshi Gen Hosp, Dept Internal Med, Niihama 7928543, Japan
[6] Ehime Prefectural Cent Hosp, Dept Pulm Med, Matsuyama, Ehime 7900024, Japan
[7] Natl Hosp Org, Minami Okayama Med Ctr, Dept Pulm Med, Tsukuba 7010304, Japan
[8] Sanyo Hosp, Natl Hosp Org, Dept Med, Ube, Yamaguchi 7550241, Japan
[9] Okayama Rosai Hosp, Dept Pulm Med, Okayama 7028055, Japan
[10] Okayama Med Ctr, Dept Pulm Med, Okayama 7011192, Japan
[11] Okayama Univ, Dept Radiol, Grad Sch Med Dent & Pharmaceut Sci, Okayama 7008558, Japan
[12] Aichi Canc Ctr, Inst Res, Dept Epidemiol & Prevent, Nagoya, Aichi 4948681, Japan