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Ang CY, Yew AK, Tay DK, Chia SL, Yeo SJ, Lo NN, Chin PL.Ang CY, et al.Singapore Med J. 2014 Oct;55(10):526-8. doi: 10.11622/smedj.2014135.Singapore Med J. 2014.PMID: 25631893Free PMC article.