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Authors
Lee, You-Bin
Han, Kyungdo
Kim, Bongsung
Lee, Seung-Eun
Jun, Ji Eun
Ahn, Jiyeon
Kim, Gyuri
Jin, Sang-Man
Kim, Jae Hyeon https://orcid.org/0000-0001-5001-963X
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Article History
Received: 10 August 2019
Accepted: 25 October 2019
First Online: 16 November 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board (IRB) of Samsung Medical Center (IRB number: SMC 2017-07-142). An informed consent exemption was granted by the IRB because all data provided by the NHIS to researchers were de-identified.
: Not applicable.
: The authors declare that they have no competing interests.
