Park, Chae Jung http://orcid.org/0000-0002-5567-8658
Choi, Yoon Seong http://orcid.org/0000-0002-6034-9912
Park, Yae Won http://orcid.org/0000-0001-8907-5401
Ahn, Sung Soo http://orcid.org/0000-0002-0503-5558
Kang, Seok-Gu http://orcid.org/0000-0001-5676-2037
Chang, Jong-Hee http://orcid.org/0000-0003-1509-9800
Kim, Se Hoon http://orcid.org/0000-0001-7516-7372
Lee, Seung-Koo http://orcid.org/0000-0001-5646-4072
Article History
Received: 29 August 2019
Accepted: 16 October 2019
First Online: 9 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict 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. As this is a retrospective study, formal consent is not required.
: The requirement for informed consent was waived due to retrospective nature of the study.