Oertel, Michael http://orcid.org/0000-0002-2786-7013
Schmitz, Martina
Becker, Jan Carl
Eich, Hans Theodor
Schober, Anna
Article History
Received: 2 March 2019
Accepted: 27 June 2019
First Online: 15 July 2019
Conflict of interest
: M. Oertel, M. Schmitz, J.C. Becker, H.T. Eich and A. Schober declare that they have no competing interests.