Funding for this research was provided by:
Deutsche Rentenversicherung Berlin-Brandenburg (10-R-40.07.05.07.006)
Received: 17 December 2018
Accepted: 26 September 2019
First Online: 21 October 2019
Change Date: 22 July 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: Before starting the present study, a study approval request (EA1/066/15) was submitted to the ethics committee of Charité – Universitätsmedizin Berlin. It was granted on 31 March 2015. Participation in the study was voluntary. Informed written consent was obtained from all patients when enrolling them in the study.
: All interview participants signed written consent forms. They agreed that their statements can be published in an anonymous manner, which does not allow conclusions to be drawn about the participants on a personal level.
: The authors declare that they have no competing interests.