Ethical considerations
The Research Ethics Committee of Faculty of Dentistry – Mansoura University provided ethical permission before starting the study (Code: A14030821). The patients’ parents or guardians were thoroughly told about the survey and signed informed consent. The patients’ acceptance to participate in the survey was also obtained.The following information was gathered for each participant: an allocation number, name, gender, age, telephone number, address, and a unique code. All patients’ information was kept confidential. The data was kept in a secure location, with no one else having access to it except the principal investigator.