Funding for this research was provided by:
Korea Workers' Compensation & Welfare service (0720185002 and 0720205002)
Received: 23 October 2019
Accepted: 24 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of Institutional Review Board in Seoul National University Hospital (IRB No. 1607–044-744). the informed consent obtained was written.
: Not Applicable.
: Jeong-Eun Lee, Su Bin Yoo, and Ja-Ho Leigh declares that he has no conflict of interest now.