Groth, M.
Ernst, M.
Deindl, P.
Herrmann, J.
Article History
Received: 26 July 2017
Accepted: 21 August 2017
First Online: 5 September 2017
Compliance with ethical guidelines
:
: M. Groth, M. Ernst, P. Deindl and J. Herrmann declare that they have no competing interests.
: The study has been approved by the local ethics committee and the requirement for informed consent was waived. All examinations were conducted according to the Declaration of Helsinki from 1964 (in its current revised form).