Data availability
The following analyses were based on data from a registered randomized controlled trial (RCT; National Clinical Trial Identifier: NCT01590992). The data and material of the study are not publicly available due to privacy or ethical restrictions. In the case of inquiries by third parties that wish to reuse data that support the findings of this manuscript, they may submit a request to the corresponding author and will have to obtain authorization of the responsible ethics committee as ordained in the Ordinance of 20 September 2013 on Human Research with the exception of Clinical Trials (Human Research Ordinance, HRO). Only upon collection of all important consents and upon approval of the responsible ethics committee(s), the fully anonymized requested data will be transferred to the third party. Third parties must confirm and provide evidence to comply with all relevant Swiss and cantonal laws and regulations (especially regarding data protection and Human Research), as well as all obligations and regulations set out in the documents and contracts related to the project. Fees may apply to cover expenses related to the data reuse. The clinical trial protocol, intervention manuals, as well as the R-code for the statistical analysis are available upon request.