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.
Betkowski A, Cyran-Rymarz A, Kuźniar W.Betkowski A, et al.Wiad Lek. 1981 Aug 15;34(16):1401-4.Wiad Lek. 1981.PMID: 7340157Polish.No abstract available.