Funding for this research was provided by:
the FoRUM Forschungsreferat (research office) of the Medical Faculty of the Ruhr-University Bochum
Received: 5 June 2020
Accepted: 30 September 2020
First Online: 22 October 2020
Ethics approval and consent to participate
: In accordance with the Helsinki Declaration of 1975, the study was approved by the local university Ethics Committee of the Medical Faculty, Ruhr University Bochum, Germany (16–5914-BR). All subjects gave full informed consent in writing.
: Not applicable.
: The authors declare that they have no competing interests.