Text and Data Mining valid from 2019-01-05
Received: 23 November 2018
Accepted: 18 December 2018
First Online: 5 January 2019
Compliance with ethical standards
: The authors declare no conflicts of interest.
: This article does not contain any studies with human participants and we utilized the data described in our previous study [CitationRef removed]. IRB approval is not applicable for an opinion-based letter.