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.
Wagner H, Kostka KH, Lehr CM, Schaefer UF.Wagner H, et al. Among authors: lehr cm.J Control Release. 2001 Aug 10;75(3):283-95. doi: 10.1016/s0168-3659(01)00396-0.J Control Release. 2001.PMID: 11489316