How, Guo Yuan
Pua, Uei
Article History
Received: 1 September 2020
Accepted: 28 October 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the National Healthcare Group Domain Specific Review Board. Waiver of consent was also obtained. NHG DSRB Ref: 2020/00777.
: Not applicable.
: The authors declare that they have no competing interests.