Funding for this research was provided by:
National Medical Research Council (NRMC/PPG/AH(KTPH)/2011)
Khoo Teck Puat Hospital Star Grant (STAR17109, STAR17202)
Received: 28 February 2019
Accepted: 7 May 2019
First Online: 30 May 2019
Ethics approval and consent to participate
: The study has been approved by the Singapore National Healthcare Group Domain Specific Review Board (DSRB2017/00287). Written consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.