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Authors
Haller, Bernhard https://orcid.org/0000-0002-9723-393X
Ulm, Kurt
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Funding
Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (Open-Access Publishing Programme)
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More Information
Article History
Received: 2 November 2017
Accepted: 22 January 2018
First Online: 20 February 2018
Ethics approval and consent to participate
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: The authors declare that they have no competing interests.
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