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Forest plot summarizing the association between telomere length (comparing shortest quartile vs. longer quartiles) and survival of colorectal cancer within subgroups of peripheral blood leukocytes and tumor tissue using random effects model. (References: Chen Y 2014 [40], Svenson U 2016 [35], Gertler R 2004 [36], Valls C 2010 [37], Suraweera N 2016 [38]).
