Funding for this research was provided by:
Received: 11 December 2020
Accepted: 26 May 2021
First Online: 9 June 2021
: This study was performed in line with the principles of the Declaration of Helsinki. The study was approved by the leading ethics committee of the University of Leipzig (reference number: 098/15-ff) and by the corresponding ethics committees of all participating hospitals. Patients gave their written consent to participate in the study after receiving appropriate information.
: Not applicable.
: The authors declare that they have no conflict of interest.