Edler, Carolin
Sperhake, Jan Peter
Püschel, Klaus
Schröder, Ann Sophie
Article History
Accepted: 12 June 2019
First Online: 1 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was waived due to the retrospective nature of this study.
: All procedures performed in studies involving human participants were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.