Received: 8 March 2020
Accepted: 30 July 2020
First Online: 18 September 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Helwan University, meeting number 5 on the 2nd day of December 2015. The study participants gave written informed consent.
: Written informed consent to publish was taken from students participating in the study.
: There are no competing interests<b>.</b>