Schröder, Lars http://orcid.org/0000-0001-6908-989X
Hellmund, Astrid
Gembruch, Ulrich
Merz, Waltraut Maria
Article History
Received: 16 December 2019
Accepted: 13 February 2020
First Online: 9 March 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The University Bonn Institutional Review Board does not require formal approval for retrospective observational studies; therefore, ethical approval was not sought.
: Informed consent was obtained from all individual participants included in the study.