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BioRisk 8: 111-120
doi:
10.3897/biorisk.8.4038
Approved:
07 Mar 2013 | Published:
08 Aug 2013
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Authors
Winfried Schroeder
- Corresponding author
Universität Vechta, Vechta, Germany
Universität Vechta, Vechta, Germany
Conflict of interest
The authors have declared that no competing interests exist.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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