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.
1 From the Center for Reproductive Medicine, Amsterdam Reproduction and Development Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam (S.M.), and the Department of Health, Ethics and Society, Research School GROW, Maastricht University, Maastricht (G.W.) - both in the Netherlands; and the Department of Medical Science, Brown University, Providence, RI (E.Y.A.).
1 From the Center for Reproductive Medicine, Amsterdam Reproduction and Development Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam (S.M.), and the Department of Health, Ethics and Society, Research School GROW, Maastricht University, Maastricht (G.W.) - both in the Netherlands; and the Department of Medical Science, Brown University, Providence, RI (E.Y.A.).