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. 2020 Sep 20;12:1758835920958358. doi: 10.1177/1758835920958358

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© The Author(s), 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Study flowchart for patients’ inclusion and exclusion.

ER, oestrogen receptor; HER2, human epidermal growth factor receptor 2; PR, progesterone receptor; PSM, propensity score matching; SEER, Surveillance, Epidemiology, and End Results.