Positive lymph node ratio as a nodal staging system to avoid stage migration between remnant and primary proximal gastric cancers by Daiki Matsubara, Shuhei Komatsu, Tomoki Konishi, Keiji Nishibeppu, Takuma Ohashi, Hirotaka Konishi, Takeshi Kubota, Hitoshi Fujiwara, Kazuma Okamoto, Eigo Otsuji, Atsushi Shiozaki

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