Funding for this research was provided by:
Qatar National Research Fund (NPRP 8-1406-2-605)
Text and Data Mining valid from 2020-01-29
Received: 18 September 2019
Accepted: 29 December 2019
First Online: 29 January 2020
Ethics approval and consent to participate
: Not applicable.
: All authors agreed to publish the paper.
: The authors declare that they have no competing interests.