Funding for this research was provided by:
Grants for research from the Faculty of Dentistry, Chulalongkorn University. (DRF61010)
Received: 15 January 2020
Accepted: 5 April 2020
First Online: 19 April 2020
Ethics approval and consent to participate
: This research has been performed in accordance with the Declaration of Helsinki. Ethical approval was obtained from the institute’s committee on human research of the Faculty of Dentistry, Chulalongkorn University (HREC_DCU 2017–084). Written informed consent was obtained from the parents or guardians.
: Not applicable.
: The authors declare that they have no competing interests.