Funding for this research was provided by:
Received: 26 February 2019
Accepted: 25 December 2020
First Online: 10 February 2021
Ethics approval and consent to participate
: The study was approved by the Ethical Committee of the Institutional Review Board of the Faculty of Dentistry in Damascus University, Syria in may-16–2016 (Ethics approval #2039). Children were given a written consent form. Only children with signed consents from parent(s) or guardian(s) were enrolled in this study.
: Not applicable.
: The authors declare that they have no competing interests.