Jeon, Yong Duk
Seong, Hye
Kim, Dokyun
Ahn, Mi Young
Jung, In Young
Jeong, Su Jin
Choi, Jun Yong
Song, Young Goo
Yong, Dongeun
Lee, Kyungwon
Kim, June Myung
Ku, Nam Su
Article History
Received: 7 March 2018
Accepted: 1 August 2018
First Online: 9 August 2018
Ethics approval and consent to participate
: This study was approved by the institutional review board (IRB) of the Yonsei University Health System Clinical Trial Center. The IRB waived the requirement for informed consent because we retrospectively reviewed the medical records.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.