Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (DFG GRK 1498)
Deutscher Akademischer Austauschdienst (DAAD A/10/98506)
Seventh Framework Programme (FP7-249170)
Text and Data Mining valid from 2018-08-13
Received: 13 December 2017
Accepted: 19 June 2018
First Online: 13 August 2018
: The authors declare that they have no competing interests.
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