Text and Data Mining valid from 2018-09-30
Accepted: 19 September 2018
First Online: 30 September 2018
Change Date: 14 November 2018
Change Type: Correction
Change Details: The publisher regret that a typographical error was present in the Table 1 of the original version of this article. The value “20,032” should have been “2” in the Variable column under T stage. The correct table is now presented correctly in this article.
Compliance with ethical standards
: The authors declare that they have no conflict of interest.