Text and Data Mining valid from 2018-10-23
Received: 25 April 2018
Accepted: 9 October 2018
First Online: 23 October 2018
Compliance with ethical guidelines
: E. Gkika, I. Strouthos, S. Kirste, S. Adebahr, M. Schultheiss, D. Bettinger, R. Fritsch, V. Brass, L. Maruschke, H.P. Neeff, S.A. Lang, U. Nestle, A.-L. Grosu and T.B. Brunner declare that they have no competing interests.
: The study was evaluated by the ethics committee of the University Hospital of Freiburg. Consent to publish was obtained. This article does not contain any studies with human participants or animals performed by any of the authors.