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Whurr, R. and Bhatia, K.P. and Marsarei, A. and Lorch, Marjorie and Kingsley, D. and Pramstaller, P.P. and Srinivasan, A. and Marsden, C.D. (1999) The incidence and nature of dysphagia following botulinum toxin injections for torticollis. Journal of Medical Speech - Language Pathology 7 (3), pp. 195-207. ISSN 1065-1438.