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.
Menendez-Pelaez A, Mayo JC, Sainz RM, Perez M, Antolin I, Tolivia D.Menendez-Pelaez A, et al. Among authors: tolivia d.Anat Embryol (Berl). 1992;186(1):91-7. doi: 10.1007/BF00710405.Anat Embryol (Berl). 1992.PMID: 1514706