1. To measure short-term effects (4 months), a randomized controlled trial (RCT) design with a delayed intervention will be used [5]. Eligible patients will be randomized after consent to receive either the intervention within a short period of time (Group A) or 4 months later (Group B); self-reported mailed questionnaires will be completed at baseline (T1) for all patient participants, 4 months after the end of the intervention for group A (T2) and 4 months after baseline for control group B (T2). This will constitute the short-term measure of effectiveness of the intervention. Group B will then receive the intervention.