Lee, Sun Hwa
Yun, Seong Jong http://orcid.org/0000-0002-3775-5701
Article History
Received: 15 July 2018
Accepted: 9 October 2018
First Online: 15 October 2018
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.
: This study has been approved by the ethics committee and has been performed in accordance with the ethical standards laid down in the Declaration of Helsinki. Due to the retrospective nature of the study, no informed consent was obtained from the included cohort as judged by the ethics committee.