Lee, Kil-yong
Park, Ji Won
Lee, Ki-young
Cho, Sangsik
Kwon, Yoon-Hye
Kim, Min Jung
Ryoo, Seung-Bum
Jeong, Seung-Yong
Park, Kyu Joo
Article History
Accepted: 4 January 2019
First Online: 19 January 2019
Compliance with ethical standards
: This study was conducted with the approval of the institutional review board (IRB) of Seoul National University Hospital. Requirement for consent was waived with permission from the IRB. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.