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 ZL, Liu ZJ, Liu JP, Kwong JS.Liu ZL, et al. Among authors: kwong js.Cochrane Database Syst Rev. 2012 Nov 14;11:CD003711. doi: 10.1002/14651858.CD003711.pub4.Cochrane Database Syst Rev. 2012.PMID: 23152220Updated.Review.
Liu ZL, Liu ZJ, Liu JP, Yang M, Kwong J.Liu ZL, et al.Cochrane Database Syst Rev. 2010 Jul 7;(7):CD003711. doi: 10.1002/14651858.CD003711.pub3.Cochrane Database Syst Rev. 2010.PMID: 20614436Free PMC article.Updated.Review.
Liu ZL, Liu ZJ, Liu JP, Kwong JS.Liu ZL, et al. Among authors: kwong js.Cochrane Database Syst Rev. 2013 Aug 28;(8):CD003711. doi: 10.1002/14651858.CD003711.pub5.Cochrane Database Syst Rev. 2013.PMID: 23986406Updated.Review.
Liu ZL, Liu ZJ, Liu JP, Kwong JS.Liu ZL, et al. Among authors: kwong js.Cochrane Database Syst Rev. 2016 May 3;2016(5):CD003711. doi: 10.1002/14651858.CD003711.pub6.Cochrane Database Syst Rev. 2016.PMID: 27142939Free PMC article.Review.
Mao C, Fu XH, Yuan JQ, Yang ZY, Chung VC, Qin Y, Huang Y, Tam WW, Kwong JS, Xie W, Tang JL.Mao C, et al. Among authors: kwong js.Cochrane Database Syst Rev. 2015 May 21;(5):CD010237. doi: 10.1002/14651858.CD010237.pub2.Cochrane Database Syst Rev. 2015.PMID: 25994229Review.