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Ng KT, Li JP, Ng KM, Tipoe GL, Leung WK, Fung ML.Ng KT, et al. Among authors: leung wk.J Periodontol. 2011 Jan;82(1):136-41. doi: 10.1902/jop.2010.100100. Epub 2010 Nov 2.J Periodontol. 2011.PMID: 21043802