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Yu WC, Tai EL, Fu SN, Kwong KC, Yeung YC, Chang Y, Yiu YK, Tam CM.Yu WC, et al. Among authors: yeung yc.Hong Kong Med J. 2011 Aug;17(4):306-14.Hong Kong Med J. 2011.PMID: 21813900Free article.
Yu WC, Fu SN, Tai EL, Yeung YC, Kwong KC, Chang Y, Tam CM, Yiu YK.Yu WC, et al. Among authors: yeung yc.Int J Chron Obstruct Pulmon Dis. 2013;8:389-95. doi: 10.2147/COPD.S48659. Epub 2013 Aug 26.Int J Chron Obstruct Pulmon Dis. 2013.PMID: 24009418Free PMC article.
Yu WC, Yu EL, Kwok HC, She HL, Kwong KK, Chan YH, Tsang YL, Yeung YC.Yu WC, et al. Among authors: yeung yc.Hong Kong Med J. 2018 Apr;24(2):158-165. doi: 10.12809/hkmj176823. Epub 2018 Apr 4.Hong Kong Med J. 2018.PMID: 29622759Free article.