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.
Liu JP, Yang M, Du XM.Liu JP, et al.Cochrane Database Syst Rev. 2004;(3):CD003711. doi: 10.1002/14651858.CD003711.pub2.Cochrane Database Syst Rev. 2004.PMID: 15266498Free PMC article.Updated.Review.
Liu JP, Yang M, Liu YX, Wei M, Grimsgaard S.Liu JP, et al. Among authors: liu yx.Cochrane Database Syst Rev. 2006 Jan 25;(1):CD004116. doi: 10.1002/14651858.CD004116.pub2.Cochrane Database Syst Rev. 2006.PMID: 16437473Review.
Fei YT, Liu JP.Fei YT, et al. Among authors: liu jp.Zhongguo Zhong Yao Za Zhi. 2008 Jan;33(1):89-94.Zhongguo Zhong Yao Za Zhi. 2008.PMID: 18338628Chinese.