Received: 4 February 2019
Accepted: 30 June 2019
First Online: 28 August 2019
Ethics approval and consent to participate
: The ethical approval for conducting this study was obtained from the Head of Research Ethics Committee (HA-06-B-001) in King Khalid University (REC) # 2016-08-23). The informed consent of participants was obtained prior to their participation in this study.
: Not applicable.
: The authors declare that they have no competing interests.