Text and Data Mining valid from 2019-11-08
Received: 19 February 2019
Accepted: 10 September 2019
First Online: 8 November 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest and all contribute equally in this work for results compilation and other technical support.
: This work is based on publicly available datasets. This article does not contain any studies with human participants or animals performed by any of the authors.
: Not Applicable.