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Conflict of Interest statement: All authors have no conflicts of interest.
Funding: There is no fund support for this study.
Figure Legend
Fig 1. Kaplan-Meier estimates for overall survival (OS) and event-free survival (EFS). 5-year OS was 79.2%; 5-year EFS was 73.7%.
Fig 2. Kaplan-Meier estimates for overall survival (OS) of different tumor margin. 5-year OS of margin > 1cm, 0.5-1cm, < 0.5cm and close to the tumor margin were 100%, 78.0%, 83.3% and 53.3%, respectively.