Kirschberg, Julia
Goralski, Szymon
Layher, Frank
Sander, Klaus
Matziolis, Georg http://orcid.org/0000-0002-5105-5875
Article History
Received: 5 July 2017
First Online: 2 February 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does contain only data that were collected in previous prospective studies that were performed on the basis of ethical approvals (number 5334-11/17).
: Informed consent was obtained from all individual participants on the basis of the previously performed prospective studies.