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Chung YF, Thng CH, Lui HF, Mancer K, Chow PK, Tan YM, Cheow PC, Ooi LL.Chung YF, et al. Among authors: cheow pc.Singapore Med J. 2005 Jan;46(1):31-6; quiz 37.Singapore Med J. 2005.PMID: 15633007Free article.