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.
Welles JS, Harris PN, Small RM, Worth HM, Anderson RC.Welles JS, et al.Ann N Y Acad Sci. 1966 Apr 20;135(2):960-73. doi: 10.1111/j.1749-6632.1966.tb45537.x.Ann N Y Acad Sci. 1966.PMID: 5220249No abstract available.