An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Lee SJ, Oh J, Ko YG, Lee S, Chang BC, Lee DY, Kwak YR, Choi D.Lee SJ, et al. Among authors: chang bc.Yonsei Med J. 2016 Jan;57(1):81-7. doi: 10.3349/ymj.2016.57.1.81.Yonsei Med J. 2016.PMID: 26632386Free PMC article.
Lee SH, Youn YN, Chang BC, Joo HC, Lee S, Yoo KJ.Lee SH, et al. Among authors: chang bc.Yonsei Med J. 2017 Sep;58(5):968-974. doi: 10.3349/ymj.2017.58.5.968.Yonsei Med J. 2017.PMID: 28792140Free PMC article.
Kim HH, Lee S, Lee SH, Chang BC, Youn YN, Yoo KJ, Joo HC.Kim HH, et al. Among authors: chang bc.Yonsei Med J. 2020 Jan;61(1):40-47. doi: 10.3349/ymj.2020.61.1.40.Yonsei Med J. 2020.PMID: 31887798Free PMC article.
Cho IJ, Hong GR, Lee SH, Lee S, Chang BC, Shim CY, Chang HJ, Ha JW, Chung N.Cho IJ, et al. Among authors: chang hj, chang bc.Yonsei Med J. 2016 Mar;57(2):328-36. doi: 10.3349/ymj.2016.57.2.328.Yonsei Med J. 2016.PMID: 26847283Free PMC article.