Received: 19 April 2020
Accepted: 12 August 2020
First Online: 15 September 2020
Ethics approval and consent to participate
: This article was approved by the Institutional Review Board of Seoul National University (S-D20180024).
: Informed consent was obtained from the individual patient included in this study.
: Mi Young Eo, Yun Ju Cho, Truc Thi Hoang Nguyen, Mi Hyun Seo, and Soung Min Kim declare that they have no competing interests.