Park, Keun Young
Jang, Chang Ki
Lee, Jae Whan
Kim, Dong Joon
Kim, Byung Moon
Chung, Joonho http://orcid.org/0000-0003-2745-446X
Article History
Received: 2 July 2019
Accepted: 20 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: All procedures performed in the studies involving human participants were in accordance with the ethical standards of our Institutional Review Board with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. In this retrospective study, the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.