Text and Data Mining valid from 2019-02-27
Received: 16 October 2018
Revised: 29 January 2019
Accepted: 14 February 2019
First Online: 27 February 2019
Change Date: 19 March 2019
Change Type: Correction
Change Details: The original version of this article contained error. Table 2 was shown in the wrong version, thus corrected table is shown in this article.
Compliance with ethical standards
: The authors declare that they have no conflict of interest.