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.
Zhang Y, Lin HK, Frimberger D, Epstein RB, Kropp BP.Zhang Y, et al. Among authors: frimberger d.BJU Int. 2005 Nov;96(7):1120-5. doi: 10.1111/j.1464-410X.2005.05741.x.BJU Int. 2005.PMID: 16225540
Zhang Y, Frimberger D, Cheng EY, Lin HK, Kropp BP.Zhang Y, et al. Among authors: frimberger d.BJU Int. 2006 Nov;98(5):1100-5. doi: 10.1111/j.1464-410X.2006.06447.x.BJU Int. 2006.PMID: 17034611