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 University of Michigan, Ann Arbor (J.A.N.); Ohio State University, Columbus (C.M.N.); the University of Geneva, Geneva, Switzerland (B.J.S.); and Peking University, Beijing, China (M.Z.).
1 From the University of Michigan, Ann Arbor (J.A.N.); Ohio State University, Columbus (C.M.N.); the University of Geneva, Geneva, Switzerland (B.J.S.); and Peking University, Beijing, China (M.Z.).