Abel, J. S.
Berg, C.
Geipel, A.
Gembruch, U.
Herberg, U.
Breuer, J.
Brockmeier, K.
Gottschalk, I. http://orcid.org/0000-0002-7750-6769
Funding for this research was provided by:
Universität zu Köln
Article History
Received: 12 November 2020
Accepted: 9 April 2021
First Online: 24 May 2021
Declarations
:
: The authors declare that there is no conflict of interest.
: The institutional review boards of the centers included in the study do not require formal approval for retrospective archives studies. Therefore, ethical approval was not sought.
: Due to the retrospective observational design of the study, no informed consent was necessary.