Funding for this research was provided by:
Universitätsklinikum Schleswig-Holstein - Campus Lübeck
Received: 9 April 2020
Revised: 9 June 2020
Accepted: 16 June 2020
First Online: 25 June 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This is a retrospective study and was therefore exempt from institutional review board approval. The authors followed the guidelines of the Declaration of Helsinki during the entire research process. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.