Hwang, Hyeontaek
Choi, Sun Mi
Lee, Jinwoo
Park, Young Sik
Lee, Chang-Hoon
Yoo, Chul-Gyu
Kim, Young Whan
Han, Sung Koo
Lee, Sang-Min
Article History
Received: 20 November 2019
Accepted: 6 April 2020
First Online: 22 April 2020
Ethics approval and consent to participate
: The study protocol was approved by the institutional review board and ethics committee at SNUH (IRB No. H-1703-179-843) and was conducted according to the principles of the Declaration of Helsinki. The need to obtain informed consent was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.