Received: 22 September 2017
Accepted: 17 October 2017
First Online: 15 June 2018
Ethics approval and consent to participate
: The ethical approval for conducting this study was obtained from 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.
: The authors declare that they have no competing interests.
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