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.
Vahratian A, Patel DA, Wolff K, Xu X.Vahratian A, et al. Among authors: xu x.J Womens Health (Larchmt). 2008 Jan-Feb;17(1):103-11. doi: 10.1089/jwh.2007.0391.J Womens Health (Larchmt). 2008.PMID: 18240987Free PMC article.
Dalton VK, Xu X, Mullan P, Danso KA, Kwawukume Y, Gyan K, Johnson TR.Dalton VK, et al. Among authors: xu x.Int Perspect Sex Reprod Health. 2013 Mar;39(1):42-6. doi: 10.1363/3904213.Int Perspect Sex Reprod Health. 2013.PMID: 23584467