Funding for this research was provided by:
AXA Research Fund (2016 AXA Award)
The Korean National Health Insurance Service (No. 2014-2-0010)
Text and Data Mining valid from 2020-02-22
Received: 19 June 2019
Accepted: 21 January 2020
First Online: 22 February 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the Seoul National University Institutional Review Board (IRB No. 1411/001–022).
: Not applicable.
: The authors declare that they have no competing interests.