Funding for this research was provided by:
Ministry of Health -Singapore
Received: 9 April 2020
Accepted: 10 March 2021
First Online: 31 March 2021
: Authors do not have any competing or conflicts of interest to declare.
: The study was approved by the National Healthcare Group’s Domain Specific Review Board and has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. Relevant national laws on research on human research subjects have been observed.
: Written informed consent was obtained from all respondents and their parents or legal guardians for those aged under 21 years.