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Authors
Schmidt, Insa Marie
Kreutz, Reinhold
Dräger, Dagmar
Zwillich, Christine
Hörter, Stefan
Kuhlmey, Adelheid
Gellert, Paul
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Funding
Funding for this research was provided by:
This work was supported by a grant from Knappschaft, Germany
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Article History
First Online: 6 September 2018
Compliance with Ethical Standards
:
: All authors take responsibility for all aspects of the reliability and freedom from bias of the data presented and their discussed interpretation.
: This work was supported by a grant from Knappschaft, Germany.
: Christine Zwillich and Stefan Hörter are employees at Knappschaft. Insa Marie Schmidt, Reinhold Kreutz, Dagmar Dräger, Adelheid Kuhlmey, and Paul Gellert have no conflicts of interest that are directly relevant to the contents of this article.
