Article History
Received: 21 April 2020
Accepted: 9 May 2020
First Online: 18 May 2020
Compliance with ethical standards
:
: LB, MK, LS, KK declares that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.
: German law allows the use of anonymous electronic medical records for research purposes under certain conditions. According to this legislation, it is not necessary to obtain informed consent from patients or approval from a medical ethics committee for this type of observational study that contains no directly identifiable data.