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. 2019 Sep 24;11:1758835919875851. doi: 10.1177/1758835919875851

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© The Author(s), 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.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. — Flow diagram of the study identification process.

95% CI, 95% confidence interval; CSS, cancer-specific survival; DFS, disease-free survival; HIF-1α, hypoxia-inducible factor-1α; HIF-2α, hypoxia-inducible factor-2α; HR, hazard ratio; MFS, metastasis-free survival; OS, overall survival; PFS, progression-free survival; RFS, relapse/recurrence-free survival.