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. 2021 Apr 30;8:666332. doi: 10.3389/fsurg.2021.666332

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Copyright © 2021 Han, Wu, Sun, Chong, Kang, Liu and Zhang.

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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Calibration curves for the nomogram model of predicting 1-year (A,D), 3-year (B,E), and 5-year (C,F) Lung CSS in patients with N3-NSCLC. (A–C) Internal validation using the training cohort. (D–F) External validation using the validation cohort.