Funding for this research was provided by:
National Research Foundation Singapore (NRF-CRP15-2015-02)
NRF-ISF Joint Research Grant (NRF2015-NRF-ISF001-2620)
Text and Data Mining valid from 2020-04-02
Received: 24 September 2019
Accepted: 12 March 2020
First Online: 2 April 2020
: The authors declare that they have no competing interests.