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.
Han IJ, Yuan TF, Lee JY, Yoon YS, Kim JH.Han IJ, et al. Among authors: yuan tf.Materials (Basel). 2019 Nov 10;12(22):3708. doi: 10.3390/ma12223708.Materials (Basel). 2019.PMID: 31717660Free PMC article.