Text and Data Mining valid from 2019-01-08
Received: 8 August 2018
Accepted: 12 December 2018
First Online: 8 January 2019
Ethics approval and consent to participate
: The institutional review board of the College of Medicine, King Saud University, approved the project proposal prior to the initiation of the study.
: Not applicable.
: The authors declare that they have no competing interests.
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