Nguyen, Truc Thi Hoang http://orcid.org/0000-0002-8667-6698
Eo, Mi Young http://orcid.org/0000-0001-7055-9924
Kuk, Tae Seong http://orcid.org/0000-0001-9804-7162
Myoung, Hoon http://orcid.org/0000-0002-9984-8479
Kim, Soung Min http://orcid.org/0000-0002-6916-0489
Article History
Received: 21 October 2018
Accepted: 23 January 2019
First Online: 19 March 2019
Ethics approval and consent to participate
: This retrospective data analysis was approved by the Institutional Review Board of Seoul National University (S-D20180022).
: Consent for publication was obtained from all participants.
: Truc Thi Hoang Nguyen, Mi Young Eo, Tae Seong Kuk, Hoon Myoung, and Soung Min Kim declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.