Deterioration of performance status before administration of chemotherapy as a prognostic factor in untreated advanced non-small cell lung cancer by Kenju Ando, Hirotsugu Kenmotsu, Yuichiro Nishibori, Akiko Tamura, Suguru Matsuda, Meiko Morita, Motoki Sekikawa, Kosei Doshita, Keita Miura, Hiroaki Kodama, Michitoshi Yabe, Noboru Morikawa, Yuko Iida, Nobuaki Mamesaya, Haruki Kobayashi, Ryo Ko, Kazushige Wakuda, Akira Ono, Tateaki Naito, Haruyasu Murakami, Toshiaki Takahashi

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