DRD2 and schizophrenia: Previous studies mainly focused on the relationship between DRD2 gene and schizophrenia were largely limited to coding regions (Liu et al., 2014; Liu, Liu, An, Zhang, & Wang, 2012; Yang et al., 2016) and showed that the DRD2 gene coding region polymorphisms of rs1076560, rs6277, and so on were associated with schizophrenia in the Chinese Han population (Fan et al., 2010; Zheng, Shen, & Xu, 2012).