VCAN and schizophrenia: The overall expression of circRNAs in the DLPFC brain region of schizophrenia showed a downward trend and verified hsa_circ_HP1BP3-7, hsa_circ_PPP2CA-3, hsa_circ_LONP2-6, hsa_circ_TOP1-10, hsa_circ_VCAN-2, hsa_circ_GPR137B-3, hsa_circ_ZNF236-2, and hsa_circ_MYO9A-66 were significantly down-regulated in post-mortem cortex of schizophrenia patients