Mai, Robert
Hoffmann, Stefan
Lasarov, Wassili
Buhs, Arne
Article History
Received: 19 January 2017
Accepted: 8 August 2017
First Online: 23 August 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: 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 Declaration of Helsinki and its later amendments or comparable ethical standards.