Article History
Received: 12 March 2020
Accepted: 28 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: Prior to the commencement of the study, ethical approval was obtained from the Research Ethics Committee at the Faculty of Dentistry, Alexandria University, Egypt (IRB 00010556 – IORG 0008839). Verbal consent of the parent in the presence of a witness was used due to the high illiteracy levels in this rural setting.
: Not applicable.
: None.