Received: 7 August 2018
Accepted: 6 October 2019
First Online: 16 January 2020
Ethics approval and consent to participate
: The study was approved by Ain Shams University Ethical Committee in December 2014. Written informed consent was obtained from the patients participating in the study, or their first-degree relatives if the patient was unable to provide consent due to weakness or disturbed conscious level, after informing them about the study rationale and their right to withdraw from the study at any time without any consequences.
: Not applicable
: The authors declare that they have no competing interests (regarding financial and non-financial competing interests).