Methods/Design: The trial is designed as a multicenter randomized controlled parallel group design. At each outpatient site the enrolled patients are randomized into two groups for either Group 1 (G1) with start of weekly treatment in active structured skills training group lasting for 14 weeks or allocated to Group 2 (G2) with treatment as usual/clinical management and with 15 weeks delayed start of their group treatment for comparison wth patients in the other arm. Those patients in the control condition arm receiving treatment as usual or clinical management of individual patients (G2), are thereafter switched to active structured skills training group therapy.All patients are followed up after six months with assessments of primary and secondary outcomes.