Jacob, Louis
Kostev, Karel
Kalder, Matthias
Article History
Received: 16 February 2020
Accepted: 12 March 2020
First Online: 18 March 2020
Compliance with ethical standards
:
: The authors declare that they have no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
: The database includes only de-identified data in compliance with the provisions of German data protection laws. No ethics approval is needed for retrospective data analyses that use anonymous data in Germany.