Text and Data Mining valid from 2019-12-01
Received: 9 August 2019
Accepted: 13 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: The data collected from this article did not involve human subjects so no human subjects approval was necessary.
: The authors agree that this article will be published in the APSE journal.
: The authors declare that they have no competing interests.