Causal Relationships between Homocysteine and the Polycystic Ovary Syndrome: A Mendelian Randomization Analysis

Figure 1

Study design of the Mendelian randomization analysis between homocysteine and the risk of polycystic ovary syndrome. PCOS: polycystic ovary syndrome and Hcy: homocysteine. The “×” means our study design avoids such a situation.