Morgenstern, Joseph http://orcid.org/0000-0001-6301-9575
Lailach, Susen http://orcid.org/0000-0003-4899-4721
Zahnert, Thomas
Neudert, Marcus http://orcid.org/0000-0002-3908-2328
Article History
Received: 22 April 2019
Accepted: 12 November 2019
First Online: 23 November 2019
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.
: As it is a retrospective study of existing literature, this article does not contain any studies with human participants performed by any of the authors. Therefore, an institutional ethic board review was not required.