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Nair KK, Namboodiri N, Thajudeen A, Valaparambil A, Tharakan JA.Nair KK, et al.Indian Pacing Electrophysiol J. 2011 Nov;11(6):169-72. Epub 2011 Nov 15.Indian Pacing Electrophysiol J. 2011.PMID: 22090730Free PMC article.