Funding for this research was provided by:
International Medical University, Malaysia (373/2016)
Received: 5 February 2021
Accepted: 23 July 2021
First Online: 3 August 2021
: Ethics approval was obtained from institutional Joint Research and Ethics Committee, International Medical University, Malaysia (number 373/2016). Written consent to participate was obtained from parents prior to data collection.
: Consent for publication was obtained along with the written consent to participate in this study from parents/guardians of pre-school children.
: The author declares that they have no competing interests.