Ruthard, Kristina
Raabe-Oetker, Anke
Ruthard, Johannes
Oppermann, Thomas
Duran, Ibrahim http://orcid.org/0000-0003-4044-8822
Schönau, Eckhard
Article History
Received: 17 July 2019
Revised: 14 November 2019
Accepted: 30 January 2020
First Online: 8 February 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.