Funding for this research was provided by:
SingHealth PULSES Centre (NMRC/CG/027/2017)
Received: 8 July 2019
Accepted: 16 December 2019
First Online: 21 February 2020
Ethics approval and consent to participate
: This study has been reviewed by the SingHealth Centralised Institutional Review Board for ethics approval (CIRB Reference number: 2017/2597).
: Consent of publication was obtained from all of the participants before the commencement of individual interview.
: The authors declare that they have no competing interests.