B7‐1 and programmed cell death‐ligand 1 in primary and lymph node metastasis lesions of non‐small cell lung carcinoma by Takehiro Yamada, Yasuhiro Miki, Miho Suzuki, Osamu Kondoh, Ryoko Saito‐Koyama, Katsuhiko Ono, Yoshinori Okada, Hironobu Sasano

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