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.
Qu Y, Ye JY, Han DM, Zheng L, Cao X, Zhang YH, Ding X.Qu Y, et al. Among authors: zheng l.Chin Med J (Engl). 2015 Aug 20;128(16):2162-7. doi: 10.4103/0366-6999.162506.Chin Med J (Engl). 2015.PMID: 26265608Free PMC article.