Cho, Jun Yeun
Leem, Cho Sun
Kim, Youlim
Kim, Eun Sun
Lee, Sang Hoon
Lee, Yeon Joo
Park, Jong Sun
Cho, Young-Jae
Lee, Jae Ho
Lee, Choon-Taek
Yoon, Ho Il
Article History
Received: 28 May 2018
Accepted: 14 August 2018
First Online: 10 September 2018
Ethics approval and consent to participate
: The need for informed consent for this study was waived due to the retrospective study design. The study was approved by the Institutional Review Board (IRB) and Ethics Committee of Seoul University Bundang hospital (IRB No. B-1611-372-105). This study was conducted in compliance with the Declaration of Helsinki.
: All authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.