Fig. 1From: Association of major depression, schizophrenia and bipolar disorder with thyroid cancer: a bidirectional two-sample mendelian randomized studyFlowchart of the design of a Mendelian randomized study of the causal association between psychiatric disorders and thyroid cancer. Blue solid lines represent associations between instrumental variables (SNPs) and exposure and between exposure and outcome. The red solid line represents reverse causality. psychiatric disorders include major depression, schizophrenia, and bipolar disorderBack to article page