Knaup, I.
Wagner, Y.
Wego, J.
Fritz, U.
Jäger, A.
Wolf, M.
Article History
Received: 21 September 2018
Accepted: 3 January 2019
First Online: 18 February 2019
Compliance with ethical guidelines
:
: I. Knaup, Y. Wagner, J. Wego, U. Fritz, A. Jäger and M. Wolf declare that they have no competing interests.
: The Ethics Committee of University of Aachen approved this study. All procedures performed in the study involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments. Informed consent was obtained from all individual participants included in the study.