APOL1 and cerebral creatine deficiency syndrome: The MR analysis (Figure 7) between APOL1 and CCDs among persons of African ancestry indicated that APOL1 is a direct causal factor for third‐degree AVB (OR: 1.79, 1.32–2.43; p‐value < 0.01), and the result of the sensitivity analysis is shown in Table S6.