Fig. 1From: Causal effects of endometriosis on SLE, RA and SS risk: evidence from meta-analysis and Mendelian randomizationDiagram for key assumptions of MR analyses. Exposure SNPs were used as the genetic instruments to investigate the causal effect of endometriosis on outcome. The directional arrows indicates that the genetic instruments (SNPs) are associated with the exposure and can only influence the outcome through the exposure. Dashed lines represent that the genetic instruments (SNPS) are independent of any confounding variables affecting the resultsBack to article page