[1] Sendai Kousei Hosp, Sendai, Miyagi, Japan
[2] Tohoku Univ, Dept Palliat Med, Sch Med, Sendai, Miyagi, Japan
[3] Kyoto Univ, Dept Biomed Stat & Bioinformat, Grad Sch Med, Kyoto, Japan
[4] Komagome Hosp, Dept Thorac Oncol & Resp Med, Tokyo Metropolitan Canc & Infect Dis Ctr, Tokyo, Japan
[5] Kanagawa Canc Ctr, Dept Thorac Oncol, Yokohama, Kanagawa, Japan
[6] Miyagi Canc Ctr, Dept Resp Med, Natori, Miyagi, Japan
[7] Nippon Med Sch, Dept Pulm Med & Oncol, Tokyo, Japan
[8] Juntendo Univ, Dept Resp Med, Sch Med, Tokyo, Japan
[9] Natl Hosp Org Asahikawa Med Ctr, Dept Resp Med, Asahikawa, Hokkaido, Japan
[10] JCHO Hokkaido Hosp, Dept Resp Med, Sapporo, Hokkaido, Japan
[11] Gunma Prefectural Canc Ctr, Div Resp Med, Ota, Japan
[12] Obihiro Kosei Gen Hosp, Dept Med 1, Obihiro, Hokkaido, Japan
[13] Saitama Med Univ Int Med Ctr, Dept Resp Med, Hidaka, Japan
[14] Tohoku Univ, Dept Resp Med, Sendai, Miyagi, Japan