Funding for this research was provided by:
National Office for Philosophy and Social Sciences (19BGL229)
Text and Data Mining valid from 2019-11-25
First Online: 25 November 2019
Change Date: 26 November 2019
Change Type: Correction
Change Details: The text <Emphasis Type="Italic">c</Emphasis><Subscript>1</Subscript> should read as <Emphasis Type="Italic">C</Emphasis><Subscript><Emphasis Type="BoldItalic">l</Emphasis></Subscript>.
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.
: Informed consent was obtained from all individual participants included in the study.