Kim, Jin Seok
,
Cheong, June-Won
Mun, Yeung-Chul
Jang, Jun Ho
Jo, Deog-Yeon
Lee, Jong Wook
Article History
Received: 24 August 2018
Accepted: 10 June 2019
First Online: 29 June 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: All the authors stated that the study have been approved by the appropriate institutional review board and have been performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Since this is a retrospective study, formal informed consent is not required.