Ahn, Shin Young http://orcid.org/0000-0002-6844-0614
Choi, Yoon Jin
Han, Kyungdo
Ko, Gang Jee
Kwon, Young Joo
Park, Yong-Gyu
Article History
Received: 10 November 2019
Accepted: 11 April 2020
First Online: 25 April 2020
Compliance with ethical standards
:
: The authors have declared no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was waived in this study by the Institutional Review Board (IRB) of Korea University Medical Center Guro Hospital (Seoul, Korea) (#IRB No. K2019-0642-001). Informed consent was not obtained because patient records and information were anonymized and de-identified prior to analysis. This study was also approved by National Health Insurance Service (NHIS-2019-1-413).