Funding for this research was provided by:
National Natural Science Foundation of China (81470219)
National Medical Research Council (NMRC/ CIRG/1458/2016)
Text and Data Mining valid from 2019-07-15
Received: 18 February 2019
Accepted: 23 June 2019
First Online: 15 July 2019
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and had been approved by the National Healthcare Group Domain-Specific Review Board of Singapore (Ethics approval number: DSRB D/11/228; IRB 13–509). Written consent has been obtained from study participants after detailed explanation of the study.
: Not applicable.
: The authors declare that they have no competing interests.