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Liu H, Li H, Xu M, Chung KF, Zhang SP.Liu H, et al. Among authors: zhang sp.Altern Ther Health Med. 2010 Nov-Dec;16(6):30-5.Altern Ther Health Med. 2010.PMID: 21280460Review.
Yeung WF, Chung KF, Poon MM, Ho FY, Zhang SP, Zhang ZJ, Ziea ET, Wong VT.Yeung WF, et al. Among authors: zhang sp, zhang zj.Sleep Med Rev. 2012 Dec;16(6):497-507. doi: 10.1016/j.smrv.2011.12.005. Epub 2012 Mar 21.Sleep Med Rev. 2012.PMID: 22440393Review.
Yeung WF, Chung KF, Poon MM, Ho FY, Zhang SP, Zhang ZJ, Ziea ET, Wong Taam V.Yeung WF, et al. Among authors: zhang sp, zhang zj.Evid Based Complement Alternat Med. 2012;2012:902578. doi: 10.1155/2012/902578. Epub 2012 Nov 28.Evid Based Complement Alternat Med. 2012.PMID: 23259001Free PMC article.