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Zhao T, Siu KW.Zhao T, et al.Appl Res Qual Life. 2015;10(4):647-665. doi: 10.1007/s11482-014-9345-z. Epub 2014 Jul 14.Appl Res Qual Life. 2015.PMID: 26568775Free PMC article.
Liu K, Siu KW, Gong YX, Gao Y, Lu D.Liu K, et al.Data Brief. 2016 May 12;8:14-20. doi: 10.1016/j.dib.2016.05.006. eCollection 2016 Sep.Data Brief. 2016.PMID: 27257616Free PMC article.