BDNF and mood disorder: BDNF has received attention due to its evident role in anxiety and mood disorders (Angelucci et al., 2014; Hemmings et al., 2008; Li, Chang, & Xiao, 2016; Martinowich et al., 2007; Molendijk et al., 2014; Suliman, Hemmings, & Seedat, 2013), although findings have been inconsistent across studies (Frustaci, Pozzi, Gianfagna, Manzoli, & Boccia, 2008; Hong, Liou, & Tsai, 2012; Lam, Cheng, Hong, & Tsai, 2004; Minelli et al., 2011; Notaras et al., 2015; Surtees et al., 2007; Wang et al., 2015).