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Tan JS, Thng CH, Tan PH, Cheng CW, Lau WK, Tan TW, Ho JT, Ching BC.Tan JS, et al. Among authors: thng ch.Ann Acad Med Singap. 2008 Jan;37(1):40-3.Ann Acad Med Singap. 2008.PMID: 18265896Free article.