GABRB2 and heroin dependence: Since the SCZ-associated SNPs in GABRB2 have been associated with not only SCZ but also bipolar disorder (10), heroin addiction (20), and altruism (21), and some of the SCZ-associated CNVs have been associated with other mental disorders including autism and mental retardation (14), the present study was directed as well to the analysis of GABRB2 CNVs in both SCZ and PMDD patients.