Procedure: Eligible patients, meeting all study criteria, are asked to participate in the RCT. The outcome measures will be filled in at baseline (T0), (i.e. at clinical assessment), before start of therapy (T1), (i.e. two months after baseline), after 8 sessions of therapy (T2), (i.e. 4 months after baseline), two weeks after 9 sessions of therapy (end of treatment, T3) (i.e. 5½ months after baseline) and at eight (T4) and twelve months (T5) after baseline. A physiological assessment of stress response and inflammatory response will be performed at T0 and T5.