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Yun K, Lee JS, Kim EY, Chandra H, Oh BL, Oh J.Yun K, et al.Front Med (Lausanne). 2020 Nov 19;7:583060. doi: 10.3389/fmed.2020.583060. eCollection 2020.Front Med (Lausanne). 2020.PMID: 33330540Free PMC article.
Yun K, Oh J, Hong TH, Kim EY.Yun K, et al.Front Med (Lausanne). 2021 Mar 31;8:621861. doi: 10.3389/fmed.2021.621861. eCollection 2021.Front Med (Lausanne). 2021.PMID: 33869245Free PMC article.