Received: 7 October 2019
Accepted: 31 January 2020
First Online: 22 February 2020
Ethics approval and consent to participate
: Informed written consent was obtained from all participants. The study was conducted in accordance with the stipulations of the local ethical and scientific committees of Ain Shams University and the procedures respected the ethical standards in the Helsinki Declaration of 1964. No ethics committee reference number was provided, instead, a stamped approval was given.
: Not applicable
: The authors declare that they have no competing interests.