Haake, Hans
Ludwigs, Kai http://orcid.org/0000-0003-2367-5345
Article History
Received: 30 November 2018
Accepted: 4 April 2019
First Online: 24 April 2019
Compliance with Ethical Standards
:
: We hereby confirm that no one of the authors has any conflict of interest with this publication. Additionally, we declare that this research was conducted in line with the Declaration of Helsinki which explains all main rules for human research ethics.