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History
- Received July 21, 2018
- Accepted July 31, 2018
- Published online August 13, 2018.
Copyright & Usage
Copyright © 2018 Städele et al. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.
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Author contributions
Author contributions: C.S., M.L.D., and W.S. designed research; C.S., M.L.D., and W.S. performed research; C.S., M.L.D., and W.S. analyzed data; C.S. and W.S. wrote the paper.
Disclosures
The authors declare no competing financial interests.
This work was supported by the German Research Foundation Grant DFG STE 937/9-1, the National Science Foundation Grant NSF IOS 1354932, Illinois State University, and The German Academic Exchange Service (DAAD).
Funding
National Science Foundation (NSF)
IOS 1354932Deutsche Forschungsgemeinschaft (DFG)
STE 937/9-1Deutscher Akademischer Austauschdienst (DAAD)
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