Text and Data Mining valid from 2018-12-31
Received: 23 October 2018
Accepted: 15 December 2018
First Online: 31 December 2018
Change Date: 6 February 2019
Change Type: Correction
Change Details: The original version of this article unfortunately contains an error in Equation 3.
Compliance with ethical standards
: This work is in line with the postdoctoral subject of author B.