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.
Isaksson M, Ljunggren B.Isaksson M, et al. Among authors: ljunggren b.Photodermatol Photoimmunol Photomed. 1991 Aug;8(4):164-8.Photodermatol Photoimmunol Photomed. 1991.PMID: 1814427