Kuehnl, A.
Salvermoser, M.
Knipfer, E.
Zimmermann, A.
Schmid, V.
Eckstein, H.‑H.
Article History
First Online: 20 July 2018
Compliance with ethical guidelines
:
: A. Kuehnl, M. Salvermoser, E. Knipfer, A. Zimmermann, V. Schmid and H.-H. Eckstein declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: The supplement containing this article is not sponsored by industry.