Funding for this research was provided by:
Christian Doppler Forschungsgesellschaft
Text and Data Mining valid from 2019-06-19
Received: 11 March 2019
Revised: 23 May 2019
Accepted: 25 May 2019
First Online: 19 June 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.