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.
Chen D, Jiang L, Li J, Tan Y, Ma M, Cao C, Zhao J, Wan X.Chen D, et al. Among authors: zhao j.Int J Chron Obstruct Pulmon Dis. 2021 Dec 7;16:3309-3316. doi: 10.2147/COPD.S334219. eCollection 2021.Int J Chron Obstruct Pulmon Dis. 2021.PMID: 34908833Free PMC article.
Wang L, Li J, Zhao J, Chen H, Zheng W, Wu Q, Zhang F.Wang L, et al. Among authors: zhao j.Zhonghua Nei Ke Za Zhi. 2015 May;54(5):416-9.Zhonghua Nei Ke Za Zhi. 2015.PMID: 26080820Chinese.
Liu H, Xu Y, Wang M, Hu K, Ma M, Zhong W, Zhang L, Zhao J, Li L, Wang H.Liu H, et al. Among authors: zhao j.Zhongguo Fei Ai Za Zhi. 2013 Nov;16(11):596-602. doi: 10.3779/j.issn.1009-3419.2013.11.06.Zhongguo Fei Ai Za Zhi. 2013.PMID: 24229626Free PMC article.Chinese.