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STROBE study flowchart and numbers of individuals at each stage of study. 1 We only included those treated (classes 1–2) at any single institution to ensure data consistency. 2 6th American Joint Committee on Cancer staging clinical stages 2 to 4a (2008–2009) or 7th stages 2 to 3 (2010–2015). 3 Without missing information in TCR and death registry.
