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Hefter H, Kupsch A, Müngersdorf M, Paus S, Stenner A, Jost W; Dysport Cervical Dystonia Study Group.Hefter H, et al.BMJ Open. 2011 Jan 1;1(2):e000196. doi: 10.1136/bmjopen-2011-000196.BMJ Open. 2011.PMID: 22021883Free PMC article.