Funding for this research was provided by:
National Medical Research Council (NMRC/1108/2007)
Agency for Science Technology and Research Biomedical Research Council (08/1/21/19/567)
Text and Data Mining valid from 2019-12-01
Received: 19 March 2019
Accepted: 25 November 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: The study procedures were in line with the Declaration of Helsinki and were approved by the National University of Singapore Institutional Review Board. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.