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Gündel, H; Busch, R; Ceballos-Baumann, A; Seifert, E (2007). Psychiatric comorbidity in patients with spasmodic dysphonia: a controlled study. Journal of neurology, neurosurgery and psychiatry, 78(12), pp. 1398-400. London: BMJ Publishing Group 10.1136/jnnp.2007.121699
Niedermeyer, HP; Häusler, R; Schwub, D; Neuner, NT; Busch, R; Arnold, W (2006). Evidence of Increased Average Age of Patients with Otosclerosis. In: Arnold W, Häusler R (ed.) Otosclerosis and Stapes Surgery. Adv Otorhinolaryngol (pp. 17-24). Basel: Karger 10.1159/000098664
