Karatzas, Kostas http://orcid.org/0000-0002-1033-5985
Papamanolis, Lazaros
Katsifarakis, Nikos
Riga, Marina
Werchan, Barbora
Werchan, Matthias
Berger, Uwe
Bergmann, Karl-Christian
Article History
Received: 2 June 2018
Accepted: 6 September 2018
First Online: 14 September 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests