Text and Data Mining valid from 2019-07-25
Received: 20 October 2018
Accepted: 17 July 2019
First Online: 25 July 2019
Ethics approval and consent to participate
: The research ethical approval reference number is 669\S - data: 18-04-2017, and it was obtained from the scientific committee at the faculty of dental medicine, the ethical committee at Damascus university, the ministry of education, and from the directory of education in Damascus governate, and the ethical approval is signed and approved by the following personals: 1- dean of the faculty of dental medicine – Damascus university prof. dr. Salem Rakkab, 2- Prof. dr. Chaza Koushaji head of the pediatric department, 3- Damascus university secretory and signed by prof. dr. Aattef Naddaf head of the scientific committee at Damascus university, 4- director of Damascus education directory, 5- minister of education.And official approvals from the ministry of education, and the ministry of higher education has been obtained to enter the school and collect data. Also, we obtained approvals from different security and governmental authorities to collect the data because of the war situation in Syria.Parental consent was obtained before including any of the children in the sample. On the first day visiting the school, Parental consent was given to all the children who are accepted according to the inclusion criteria, and the school staff contacted all the children parents to explain the research procedure according to the authors instructions, and on the second day visiting the school, only children with a completed and singed consent paper where included in the sample and examined, and the process repeated in each school.
: Not applicable.
: The authors declared no potential conflicts of interest with respect to the research, authorship and/or publication of this article.