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Barber TW, Kalff V, Cherk MH, Yap KS, Evans P, Kelly MJ.Barber TW, et al. Among authors: yap ks.Intern Med J. 2011 Nov;41(11):776-83. doi: 10.1111/j.1445-5994.2010.02257.x. Epub 2010 May 11.Intern Med J. 2011.PMID: 20492008