Kim, Sae Byol
Shin, Beomsu
Lee, Ji-Ho
Lee, Seok Jeong
Lee, Myoung Kyu
Lee, Won-Yeon
Yong, Suk Joong
Kim, Sang-Ha http://orcid.org/0000-0002-1763-5366
Article History
Received: 4 October 2019
Accepted: 7 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: Ethics approval was granted by the Institutional Review Board for Human Research of Yonsei University Wonju Severance Christian Hospital (CR319097). For this type of retrospective study, formal written consent was not required. The research process was in accordance with the tenets of the 1964 Declaration of Helsinki and subsequent amendments.
: Not applicable.
: The authors declare that they have no competing interests.