Article History
Received: 9 August 2019
Accepted: 9 October 2019
First Online: 18 November 2019
Ethics approval and consent to participate
: The study protocol was approved by Medical Research Ethics Committee (MREC) of the National Research Center of Egypt prior to the study commencement (Ref. no. 14008). All subjects were aware of the study protocol and gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.