Limitations
MAY, RECRUITMENT
During the first lockdown phase in Germany (March to May 2020), recruitment and data collection were completely paused, resulting in a high drop-out rate. Moreover, the chosen design as a waiting list parallel group study does not provide full elucidation of underlying mechanisms. Therefore, in the design of this study, an increase from this design to a cross-over design was discussed but discarded due to the high mortality of these patient groups. Furthermore, a higher degree of blinding would certainly have been beneficial. This advantage was accepted against the disadvantage of a possible investigator effect. Since many therapy studies suggest effects of therapists particularly with regard to their attachment styles and quality,