A statistical power analysis has been performed by statistician Linus Schiöler. Based on other studies, an effect size of 0.5 difference between the groups is clinically relevant, which equates to a 5 point difference between the groups using the BAI scale. Standard deviations from a previous study using BAI as the outcome measurement were in the interval of 5-10. SD 9 was used in the calculations. Based on these assumptions, at least 60 patients in each of the treatment arms should be included to reach 80% power at the 5% significance level. Health-economic analyses will be performed using primary data generated within the project concerning health-related quality of life effects caused by the intervention and information about healthcare resources utilized. A health-economic model that depicts the clinical trial will be constructed and used for computing cost-utility measures. Moreover, the model will be constructed for performing extensive probabilistic sensitivity analyses.