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Comparison 2: ‘Focus one’s attention away from the experience of stress by means of relaxation, exercise or something else’ vs No intervention/wait list/placebo/no stress‐reduction intervention (SMD), Outcome 4: Explanatory analysis ‐ subgroup (short vs long duration of intervention): any symptoms of stress‐related outcome (follow‐up up to 3 months after the end of the intervention)
