Article History
Received: 1 February 2018
Accepted: 29 May 2019
First Online: 13 June 2019
Compliance with Ethical Standards
:
: Oliver Laasch, Dirk C. Moosmayer, and Frithjof Arp declare that they have no conflicts 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 Helsinki declaratio± its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.