COMT and Behcet disease: Not all studies have supported the DAOA and COMT genes association with SCZ and BD (Liu et al. 2006; Shi, Badner, Gershon, & Liu, 2008; Tan et al., 2014; Jagannath et al. 2017); however, genome wide association studies of DAOA and COMT genes with SCZ and BD are available (Shifman et al., 2002; Glatt, Faraone, & Tsuang, 2003; Shifman et al., 2004; Sacchetti et al., 2013; Gatt, Burton, Williams, & Schofield, 2015); Chu et al., 2017; Jagannath, Gerstenberg Correll, Walitza, & Grünblatt, 2018).