[1] Hokkaido Canc Ctr, Dept Resp Med, Fukushima, Japan
[2] Japanese Fdn Canc Res, Canc Immunotherapy Dev, Adv Med Dev Ctr, Canc Inst Hosp, Koto Ku, Tokyo, Japan
[3] Oji Gen Hosp, Dept Resp Med, Tomakomai, Japan
[4] Akita Kousei Med Ctr, Thorac Oncol, Akita, Nishibukuro, Japan
[5] Shinshu Univ, Sch Med, 3-1-1 Asahi, Matsumoto, Nagano, Japan
[6] Teine Keijinkai Hosp, Dept Resp Med, Sapporo, Hokkaido, Japan
[7] Hakodate Goryoukaku Hosp, Dept Resp Med, Hakodate, Hokkaido, Japan
[8] JA Hokkaido Kouseiren Obihiro Kosei Gen Hosp, Dept Resp Med, Obihiro, Hokkaido, Japan
[9] Sendai Kousei Hosp, Dept Resp Med, Sendai, Miyagi, Japan
[10] Miyagi Canc Ctr, Resp Med, Natori, Miyagi, Japan
[11] Yamagata Prefectural Cent Hosp, Pulm Med, Yamagata, Japan
[12] Tohoku Univ, Dept Resp Med, Sendai, Miyagi, Japan
[13] Nagano Municipal Hosp, Dept Resp Med, Nagano, Japan
[14] Hokkaido Univ Hosp, Dept Resp Med, Sapporo, Hokkaido, Japan
[15] Hirosaki Univ, Dept Resp Med, Hirosaki, Aomori, Japan
[16] Steel Mem Muroran Hosp, Dept Resp Med, Muroran, Hokkaido, Japan
[17] Suwa Red Cross Hosp, Dept Resp Med, Suwa, Japan
[18] Natl Hosp Org Asahikawa Med Ctr, Dept Resp Med, Asahikawa, Hokkaido, Japan
[19] Kushiro City Gen Hosp, Dept Resp Med, Kushiro, Japan