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Cheung RTH, Ngai SPC, Ho KKW.Cheung RTH, et al. Among authors: ngai spc.Hong Kong Physiother J. 2017 May 10;37:46-49. doi: 10.1016/j.hkpj.2017.03.002. eCollection 2017 Dec.Hong Kong Physiother J. 2017.PMID: 30931046Free PMC article.