Buchberger, A. M. S.
Baumann, A. http://orcid.org/0000-0001-6254-8352
Johnson, F.
Peters, N.
Piontek, G.
Storck, K.
Pickhard, A.
Article History
Received: 22 February 2018
Accepted: 16 June 2018
First Online: 23 June 2018
Compliance with ethical standards
:
: The authors declare no conflicts of interest. Also, they declare that the manuscript has not been submitted to more than one journal for simultaneous consideration. The manuscript has not been published previously (partly or in full), unless the new work concerns an expansion of previous work. The single study is not split up into several parts. No data have been fabricated or manipulated to support our conclusions. No data, text, or theories by others are presented as if they were the author’s own. The manuscript has been read and improved by all authors. The requirements for authorship have been met.
: This article does not contain any studies with animals performed by any of the authors. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was retrospective and was done in an anonymized way according to the data privacy protection law and in agreement to our ethic committee (90/16 S).