Fig. 38.4
Distribution of age at onset, by sex, in 151 patients with spasmodic torticollis.
Reproduced with permission from Duane DD. Spasmodic torticollis: clinical and biologic features and their implications for focal dystonia. In: Advances in Neurology: Dystonia 2. Eds Fahn S, Marsden CD, Calne DB. Raven Press, 1988; Vol 50: pp 473–492.© Lippincott Williams & Wilkins.
