Fig. 1From: Exploration of the causal effects of leukocyte telomere length and four gastrointestinal diseases: a two-sample bidirectional Mendelian randomization studyMendelian Randomization Flowchart. Panel: (A) The red lines and rectangles illustrate the forward analysis with LTL as the exposure and chronic gastrointestinal diseases as the outcome, while the blue lines and rectangles represent the reverse analysis with chronic gastrointestinal diseases as the exposure and LTL as the outcome. (B) The MR analysis relies on three key assumptionsBack to article page