Article History
Received: 16 February 2019
Accepted: 4 September 2019
First Online: 4 December 2019
Ethics approval and consent to participate
: Ethical approval was obtained from ethical committee, Faculty of Medicine, Ain Shams University. An informed written consent was obtained from all the students after informing them about the aim of the study and assuring the confidentiality of all provided data and that no personal identifying data would be used in the study.
: Not applicable.
: The authors declare that they have no competing interests.