Received: 18 September 2019
Accepted: 16 July 2020
First Online: 3 August 2020
Ethics approval and consent to participate
: All procedures in the study ACTonPain [CitationRef removed, CitationRef removed], in which the present data was collected, were approved by the ethics committee at the Albert-Ludwigs-University of Freiburg (Nr.: 387/14). The ACTonPain trial was registered at the German Clinical Trial Register (DRKS): DRKS00006183. Only eligible participants who provided an informed consent were included in the study.
: All authors read and approved the final version of this manuscript.
: The authors declare that they have no competing interests.