Text and Data Mining valid from 2019-08-06
Received: 17 June 2019
Revised: 1 July 2019
Accepted: 25 July 2019
First Online: 6 August 2019
Compliance with Ethical Standards
: All three authors, Sharif, Samari and Alcalá, declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.