The five-item modified frailty index predicts long-term outcomes in elderly patients undergoing colorectal cancer surgery by Toshiro Ogata, Yoshihiko Sadakari, Hiroyuki Nakane, Kazuhiro Koikawa, Hiroki Kanno, Ryo Kohata, Kayoko Endo, Takao Tsukahara, Koichiro Shimonaga, Kazuhisa Kaneshiro, Gentaro Hirokata, Takeshi Aoyagi, Chiyo Tsutsumi, Masahiko Taniguchi

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