El-Kassem, Bilal
Salloum, Nizar
Brinz, Thomas
Heider, Yousef http://orcid.org/0000-0003-2281-2563
Markert, Bernd
Article History
Received: 25 September 2019
Revised: 10 December 2019
Accepted: 10 January 2020
First Online: 29 January 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.