Article History
Received: 11 May 2018
Accepted: 12 September 2018
First Online: 10 October 2018
Compliance with ethical guidelines
:
: J. Schmalzl, N. Sadler, M. Feucht, C. Gerhardt, and L.J. Lehmann declare that they have no competing interests.
: 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 local ethics committee approved this study (Reg. Nr.: 2017-663 N-MA). Written consent was given by all participants.