Park, Yehyun
Kim, Beom Kyung
Park, Jun Yong
Kim, Do Young
Ahn, Sang Hoon
Han, Kwang-Hyub
Yeon, Jong Eun
Byun, Kwan Soo
Kim, Hye Soo
Kim, Ji Hoon
Kim, Seung Up http://orcid.org/0000-0002-9658-8050
Article History
Received: 16 February 2018
Accepted: 20 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: The study protocol was designed and applied in accordance with the ethics guidelines of the 1975 Declaration of Helsinki, and the study procedure was approved by the Institutional Review Boards of Severance Hospital and Korea University Guro Hospital.
: Due to the retrospective nature of this study, written informed consent was not required.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.