The goal of this clinical trial is to compare brief-intensive cognitive-behaviour therapy (CBT) with regular weekly CBT in people with anxiety-related disorders. The main question to answer is: will brief-intensive CBT improve functioning (work, family, social) more and faster than does regular weekly CBT? Participants will be asked to follow CBT treatment (20 sessions of 45 minutes in both conditions), and participate in 7 measurements with a total duration of 5 hours over 1 year. Researchers will compare: * Brief-intensive CBT: 16 sessions in 2 weeks + 4 follow-up sessions within 3 months * Regular CBT with 20 weekly sessions in 6 months
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Area Under the health and disability Curve at 6 months
Timeframe: baseline, 2 weeks, 4 weeks, 2 months, 3 months, 6 months