GAD treatment protocol. CBT-manual (Zinbarg et al., 2006): Traditional cognitive-behavioral therapy (CBT) for GAD typically consists of psycho education of generalized anxiety disorder, relaxation training (RT), cognitive restructuring (CR) and with some in-vivo situational exposure for patients with overt behavioral avoidance (e.g., Barlow, Rapee, & Brown, 1992; Borkovec & Costello, 1993). Furthermore, imagery exposure as a GAD-specific form of in-sensu exposition will be applied to reduce experiential avoidance based on a well-introduced CBT-manual (Zinbarg et al., 2006). The manualized therapy follows an usual time-limited treatment format of 14 sessions to 50 minutes and a booster session after 6-months (total 15 sessions).