Funding for this research was provided by:
University of Zabol
Text and Data Mining valid from 2020-04-06
Received: 12 September 2019
Accepted: 24 March 2020
First Online: 6 April 2020
Ethics approval and consent to participate
: Not applicable. The study uses open data, and ethics approval and consent is not needed.
: Not applicable.
: The authors declare that they have no competing interests.