Funding for this research was provided by:
Received: 10 May 2019
Accepted: 9 August 2019
First Online: 20 August 2019
Ethics approval and consent to participate
: Ethics approval was obtained from the Ethics Review Board, Faculty of Dentistry, Universitas Indonesia (Protocol Number: 090670716). This research was conducted in full accordance with the World Medical Association Declaration of Helsinki. The principal investigator is responsible for ensuring the confidentiality of the study documents and protecting the anonymity of all respondents. All participants provided informed consent. Parental written consent was obtained.
: Not applicable.
: The authors declare that they have no competing interests.