Funding for this research was provided by:
Deanship of Scientific Research, King Saud University (RG-1439-60)
Text and Data Mining valid from 2019-07-01
Received: 14 March 2019
Accepted: 19 June 2019
First Online: 1 July 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.