Text and Data Mining valid from 2019-06-12
Received: 10 March 2019
Accepted: 25 April 2019
First Online: 12 June 2019
Compliance with Ethical Standards
: The authors have no conflict of interests and the paper has not been submitted to any other Journals.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: It is not required as the dataset is taken online databases.