Funding for this research was provided by:
Received: 17 April 2020
Accepted: 27 December 2020
First Online: 13 January 2021
Ethics approval and consent to participate
: The prospective observational study was approved by the ethic committee of the University Witten/Herdecke (72/2016).
: Not applicable.
: Written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.