ZNF804A and schizophrenia: However, in a previous study, we performed a relatively systematic analysis of the ZNF804A region (up to 111 SNPs) in several Han Chinese samples (Singapore, Yuxi, Shanghai and Anhui, Beijing and Shandong, and Guangdong and Guangxi), which we did include in the present study and found that most of the common SNPs in ZNF804A were not associated with schizophrenia in Chinese populations [18].