Funding for this research was provided by:
National Research Foundation of Korea (2017R1D1A1B03033771)
Text and Data Mining valid from 2020-03-17
Received: 11 September 2019
Accepted: 3 March 2020
First Online: 17 March 2020
Ethics approval and consent to participate
: Approval from the Institutional Review Board of Eulji University (EU2018–90) was received before the study began. In addition, approval to use the original data was obtained through the NHIS (NHIS-2019-1-030). A temporary ID was given to prevent individuals from being identified when merging the NHIS data, patient personal information, hospital data, and data from Statistics Korea. This study was conducted in accordance with the Ethical Principles for Human Subjects, as defined by the Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.