Article History
Received: 30 October 2018
Accepted: 23 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board (IRB) of King Saud University (reference number E-17-2580). All the participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.