Engel, Julia
van Kampen, Vera http://orcid.org/0000-0002-5694-4663
Gering, Vitali
Hagemeyer, Olaf
BrĂ¼ning, Thomas http://orcid.org/0000-0001-9560-5464
Raulf, Monika http://orcid.org/0000-0001-6315-120X
Merget, Rolf http://orcid.org/0000-0002-0580-7597
Article History
Received: 7 November 2018
Accepted: 9 May 2019
First Online: 29 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all participants for being included in the study.