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Contributors FCW helped in the planning and concept of study. Acquisition of data was done by FUW. Data interpretation, writing of the manuscript and manuscript revision were done by FUW, FL and MML.
Funding This work was supported by the PePPP-project (ESF/14-BM-A55_0045/16) the EnErGie/P2 Project (ESF/14-BM-A55-0008/18), and the RESPONSE-project (BMBF grant number 03ZZ0921E).
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting or dissemination plans of this research.
Provenance and peer review Not commissioned; externally peer reviewed.