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Samuel GS, Oey NE, Choo M, Ju H, Chan WY, Kok S, Ge Y, Van Dongen AM, Ng YS.Samuel GS, et al.Singapore Med J. 2017 Oct;58(10):610-617. doi: 10.11622/smedj.2016111. Epub 2016 Jun 17.Singapore Med J. 2017.PMID: 27311739Free PMC article.Clinical Trial.