[1] Tohoku Univ Hosp, Sendai, Miyagi, Japan
[2] Sendai Kosei Hosp, Dept Resp Med, Sendai, Miyagi, Japan
[3] Hokkaido Canc Ctr, Dept Resp Med, Sapporo, Hokkaido, Japan
[4] Kanto Med Ctr NTT EC, Dept Resp Med, Tokyo, Japan
[5] Isawa Hosp, Dept Resp Med, Oshu, Japan
[6] Iwamizawa Rosai Hosp, Dept Resp Med, Iwamizawa, Japan
[7] Miyagi Canc Ctr, Dept Resp Med, Natori, Miyagi 9811293, Japan
[8] Tohoku Univ, Dept Resp Oncol & Mol Med, Inst Dev Aging & Cancer, Sendai, Miyagi 980, Japan