Study from the participants view. After contaciting the study administration, the participant's information contained a precise description of the inclusion and exclusion criteria, the structure of the treatment manual as well as the data collection procedure including the video recordings. Confidentiality of the collected data is confirmed. Volontarines of participation is emphasized by the opportunity to terminate the treatment at every timepoint during treatment and the cancelation of all conducted data. Furthermore, an insurance for possible negative outcomes of clinical trials is contracted.