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There are 54 articles by KOLD study group, and more than 100 articles stating the exact phrase \u201cKorean Obstructive Lung Disease\u201d. We suppose that many of those would have a substantial extent of subject overlaps with our current study. However, the key point of our current study was to suggest new imaging biomarkers, and those biomarkers, Dboxand Dsize, have never been measured for any of the subjects before, making our current finding novel.","order":7,"name":"Ethics","group":{"name":"EthicsHeading","label":"Study subjects or cohorts overlap"}},{"value":"\u2022 retrospective\u2022 diagnostic or prognostic study\u2022 multicentre study","order":8,"name":"Ethics","group":{"name":"EthicsHeading","label":"Methodology"}}]}}