Funding for this research was provided by:
National Medical Research Council (HSRG/0048/2015)
Received: 7 April 2020
Accepted: 3 September 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: Ethics approval was granted by the National University of Singapore Institutional Review Board (Approval Number: NUS 2592). All parents signed informed consent and assented to their child’s participation.
: Not applicable.
: We declare no competing interests.