Oertel, Michael http://orcid.org/0000-0002-2786-7013
Elsayad, Khaled
Weishaupt, Carsten
Steinbrink, Kerstin
Eich, Hans Theodor
Article History
Received: 15 April 2019
Accepted: 23 October 2019
First Online: 22 November 2019
Conflict of interest
: M. Oertel, K. Elsayad, C. Weishaupt, K. Steinbrink, and H.T. Eich declare that they have no competing interests.