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.
Faúndes A, Alvarez-Sanchez F, Brache V, Jimenez E, Tejada AS.Faúndes A, et al. Among authors: tejada as.Adv Contracept. 1991 Mar;7(1):85-94. doi: 10.1007/BF01850722.Adv Contracept. 1991.PMID: 1908178