Bernstein, Hans-Gert
Dobrowolny, Henrik
Bogerts, Bernhard
Keilhoff, Gerburg
Steiner, Johann
Article History
Received: 15 March 2018
Accepted: 30 April 2018
First Online: 16 May 2018
Compliance with ethical standards
:
: 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.
: The authors declare that they have no conflict of interest.