Song, Jin Hwa
Yoon, Seo-Young
Park, Tae Yun
Heo, Eun Young
Kim, Deog Kyeom
Chung, Hee Soon
Lee, Jung-Kyu http://orcid.org/0000-0001-5060-7255
Article History
Received: 25 June 2019
Accepted: 5 December 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: The study was approved by the institutional review board of Seoul Metropolitan Government–Seoul National University Boramae Medical Center (No: 20170214/16–2017-21/031). The informed consent of subjects was waived due to retrospective design of this study under approval of the institutional review board.
: Not applicable.
: No author has any competing interest. The abstract of this paper was presented at the American Thoracic Society Conference 2018 as a poster presentation with interim findings. The poster’s abstract was published in “Poster Abstracts” in American Journal of Respiratory and Critical Care Medicine (Am J Respir Crit Med 2018;197:A5559; ExternalRef removed).