Document is current

Article History

Received: 3 June 2020

Accepted: 12 August 2020

First Online: 27 August 2020

Ethics approval and consent to participate

: This study was approved by the ethics committee of Seoul National University Hospital (IRB-H-1304-089-481) and each participating hospital: Ajou University Hospital (AJIRB-MED-MDB-13-154); SMG-SNU Boramae Medical Center (26–2013-55); Keimyung University Dongsan Medical Center (2013–09-025); Ewha Womans University Hospital (2015–03-005); Kangdong Sacred Heart Hospital (13–2-31); Seoul National University Bundang Hospital (B-1308-216-103); Yeungnam University Medical Center (YUH-13-0408-O47); Gachon University Gil Medical Center (GBIRB2015–169); Kosin University Gospel Hospital (13–090); Yonsei Cancer Center (4–2013-0363); Asan Medical Center (2013–0598); Chungnam National University Hospital (2013–10-003). And each Institutional Review Board approved the waiver of written informed consents because of the retrospective nature of this study.

: Not applicable.

: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.