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. 2021 Aug 31;8:1023–1034. doi: 10.2147/JHC.S321346

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© 2021 Chen et al.

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OS of liver cancer by age group in Qidong, 1972–2016. Gehan statistic is 214.561, P = 0.0000, showing differences among age groups (0–14 is not included, due to cases were less than 100).