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. 2019 Aug 14;9:771. doi: 10.3389/fonc.2019.00771

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Copyright © 2019 Li, Zhan, Sui, Jiang, Shi, Yang, Feng, Wang and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Kaplan-Meier survival curves for the patients and patients with adenocarcinoma or squamous cell carcinoma separately from the FDZSH cohort (A) using the 8th edition of the TNM staging system (I; II; III; IV), (B) the 8th edition of the TNM staging system (IA; IB; IIA; IIB; IIIA; IIIB; IIIC; IV), (C) the modified edition of the TNM staging system (I; II; III; IV), (D) the modified edition of the TNM staging system (IA; IB; IIA; IIB; IIIA; IIIB; IIIC; IV).