Funding for this research was provided by:
Newton Fund (MR/P013910/1, MR/P013910/1)
Received: 20 November 2019
Accepted: 12 March 2020
First Online: 25 March 2020
Ethics approval and consent to participate
: Ethics approval for the study was granted by the Medical Research Ethics Committee, University Malaya Medical Centre (ID: 2016126–4668) and by the National Medical Research Register (ID: NMRR-17-2788-35,613 and NMRR-18-1961-42562). Consent to participate was signed by all study participants. The study was performed in accordance with the Declaration of Helsinki.
: Consent for publication was signed by all study participants.
: The authors declare that they have no competing interests.