Received: 13 June 2019
Accepted: 17 July 2019
First Online: 23 July 2019
Ethics approval and consent to participate
: The study adhered to the tenets of the Declaration of Helsinki and had received approval from the Institutional Review Board and Research Ethics Committee of College of Medicine, King Saud University, Riyadh, Saudi Arabia (approval number # 08-657). Written, informed consent was obtained from all participants prior to their inclusion in this study.
: Not applicable.
: The authors declare that they have no competing interests.