Efficacy and safety of nivolumab and ipilimumab with or without chemotherapy for unresectable non-small cell lung cancer: a multicenter retrospective observational study by Toshiyuki Sumi, Yutaro Nagano, Keiki Yokoo, Tatsuru Ishikawa, Hirotaka Nishikiori, Osamu Honjo, Sayaka Kudo, Masami Yamazoe, Shun Kondoh, Makoto Shioya, Mitsuo Otsuka, Midori Hashimoto, Hayato Yabe, Yusuke Tanaka, Yuta Sudo, Masahiro Yanagi, Mamoru Takahashi, Hirofumi Chiba

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