Oldenburg, Marcus http://orcid.org/0000-0002-3942-8886
Jensen, Hans-Joachim
Funding for this research was provided by:
Berufsgenossenschaft für Transport und Verkehrswirtschaft (“BG Verkehr“), Hamburg
Article History
Received: 14 September 2018
Accepted: 14 May 2019
First Online: 21 May 2019
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.