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.
van den Brule AJ, Hemrika DJ, Walboomers JM, Raaphorst P, van Amstel N, Bleker OP, Meijer CJ.van den Brule AJ, et al. Among authors: hemrika dj.Fertil Steril. 1993 May;59(5):1098-104. doi: 10.1016/s0015-0282(16)55935-4.Fertil Steril. 1993.PMID: 8486181Free article.