Funding for this research was provided by:
National Medical Research Council (NMRC/TCR/012-NUHS/2014, NMRC/CBRG/0039/2013, NMRC/TCR/004-NUS/2008)
Text and Data Mining valid from 2018-10-12
Received: 29 March 2018
Accepted: 5 October 2018
First Online: 12 October 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.