Received: 26 March 2021
Accepted: 21 June 2021
First Online: 31 August 2021
: The SingHealth Centralized Institutional Review Board approved this study (Reference Number: 2016/2210). We obtained informed consent, which conformed to the principle outlined in the 1964 Declaration of Helsinki, from all participants before study commencement.
: Not applicable.
: The authors declare that they have no competing interests.