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 Kooij RJ, de Boer P, De Vreeden-Elbertse JM, Ganga NA, Singh N, Te Velde ER.Van Kooij RJ, et al. Among authors: singh n.Int J Androl. 2004 Jun;27(3):140-6. doi: 10.1111/j.1365-2605.2004.00463.x.Int J Androl. 2004.PMID: 15139968